Answer
number of moles = 0.171 mol
Explanation
Given
Volume of oxygen = 4.0 L
Temperature = 37 °C = 310 K
Pressure = 110 kPa = 1.08562 atm
we know R = 0.082 L.atm.k/mol
Required: number of moles
Solution
To solve this problem, use the ideal gas law
PV = nRT
n = PV/RT
n = (1.08562 x 4.0 L)/(0.082 L.atm.k/mol x 310 K)
n = 0.171 mol
A student finds a piece of metal and finds its mass to be 750 g. Through water displacement thestudent determines the volume to be 65.8 cm". Which metal does the student have?
Metals normally have different densities, so we can try to determine which metal is this by its density.
Assuming it is pure, the density of the metal is its mass divided by its volume:
[tex]\begin{gathered} \rho=\frac{m}{V} \\ \rho=\frac{750g}{65.8cm^3} \\ \rho\approx11.4g/cm^3 \end{gathered}[/tex]Now, we need to look for some table with densities of various metals and see which one has the density we found, 11.4 g/cm³.
Since we don't have one, we can look for one. In it, we can see that the only metal with this density is lead.
So, the metal in the question should be lead.
Help I am not sure how to do this number 8
Answer: The temperature of the gas sample under the conditions given is 30.313 K
Explanation:
The question requires us to determine the temperature, in Kelvins, of a C2H6 gas sample with the following mass, volume and pressure:
mass of C2H6 = m = 561.51g
volume of gas = V = 47.048L
pressure of gas = P = 100.03 kPa
To solve this problem, we can apply the equation of ideal gases rearranged to calculate the temperature, as shown below:
[tex]PV=nRT\rightarrow T=\frac{PV}{nR}[/tex]where T is the temperature we want to calculate, P corresponds to the pressure of the gas, V is its volume, n is its number of moles and R is the constant of gases (8.314 kPa.L/mol.K).
Note that the only valye that was not provided by the question was the number of moles. We can determine the number of moles n considering the mass of the sample given (561.51g) and the molar mass of the gas C2H6, which we can determine from the atomic masses of C and H.
The atomic masses of C and H are 12.011 and 1.0078 amu, thus we can calculate the molar mass of C2H6 as:
[tex]molar\text{ mass \lparen C}_2H_6)=2\times12.011+6\times1.0078=30.069g/mol[/tex]Now that we know the mass of the gas sample (561.51 g) and the molar mas of the gas (30.069 g/mol), we can determine the number of moles of gas as it follows:
[tex]\begin{gathered} number\text{ of moles = }\frac{mass\text{ \lparen g\rparen}}{molar\text{ mass \lparen g/mol\rparen}}\rightarrow n=\frac{m}{M} \\ \\ n=\frac{561.51g}{30.069g/mol}=18.674mol \end{gathered}[/tex]Therefore, the number of moles of C2H6 gas that we need to consider is 18.674 moles.
Next, we can apply the equation of ideal gases to calculate the temperature of the gas:
[tex]\begin{gathered} T=\frac{PV}{nR} \\ \\ T=\frac{(100.03kPa)\times(47.048L)}{(18.674mol)\times(8.314kPa.L/mol.K)}=30.313K \end{gathered}[/tex]Therefore, the temperature of the gas sample under the conditions given is 30.313 K.
FOR 100 PLEASE HELP A legend is a traditional story that explains something in real life. Sometimes they are accepted as true, but sometimes they are fantastical and just plain fun. There are many legends that surround the North Star explaining its creation as well as why it is stationary.
Take some time to research some of the legends of the North Star. After you have had a chance to read several of them, create your own fantastical story of the North Star. It can be how it came to be or explain why it is stationary.
The north star are stationary because it is positioned close to earth axis.it is the brightest star in the constellation.
Star is a luminous celestial body of gas which are mostly hydrogen and helium that shines and radiate energy sources. north star named as north star because its location is exactly above north pole. north star having some spiritual meaning , it is also called as polaris. north star is in the same location every night unlike all the other star. it is the brightest star in the constellation.
Thus, The north star are stationary because it is positioned close to earth axis.it is the brightest star in the constellation.
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True or false; CH40 is an electrolyte?
Explanation:
An electrolyte has to be capable of of ionizing and CH40 is not.
Therefore, CH40 is not an electrolyte.
Answer:
False
I need help with this question The choices are fusionVaporizationSublimation FreezingCondensation Deposition
In the given illustration, it is observed that at first molecules are dispersed without any type of configuration or order and they adapt to the container shape. It means that they represent a liquid.
At the second stage, molecules are ordered and they have a defined shape, which is characteristic of solids.
It means that the change converted a liquid into a solid.
This is known as freezing. A liquid is frozen to became a solid, one example is water and ice.
It means that the correct answer is Freezing.
During freezing you release energy, this is because the liquid has to lose heat to become a solid. The answer to the second part is releases.
Could you please tell me that is true or false Surfactants are compounds that increase surface tension of a solvent.
Surfactants are characterized to lower the surface tension between two liquids or between a liquid and a gas and so on.
You can see an example for detergents: the detergents are surfactants that lower the surface tension and that's because you can see that the dirt disperses easily and other substances, so the answer is false.
At a pressure of 1.00atm the solubility of nitrogen in water is 23.5mg gas/100g water. Indicate whether each of the following changes would increase or decrease the solubility of nitrogen in water
Solubility of a substance changes as the pressure changes. If the pressure is high, solubility increases. When pressure is low, solubility decreases.
At 1 atm the solubility of Nitrogen in water is 23.5 mg gas/110g water.
The solution is submerged 40 m under water. Solubility increase.
The solution is carried to the top of a mountain. Solubility decrease.
The solution is placed in a chamber where the pressure is 0.50 atm. Solubility decrease.
The solution is brought into outer space. Solubility decrease.
The solution is canned at a pressure of 2.04 atm. Solubility increase.
The polarity of the covalent bond between two given atoms is determined/estimated byGroup of answer choicesOctet RuleElectronegativity differencesNumber of bonds between the atomsSolubility
1) Covalent bond polarity.
To determine the polarity, we use a property called electronegativity. This is a tendency to attract shared electrons in a chemical bond. If the difference in electronegativity is greater than 1.7, the bond is polar. If the difference is less than 1.7, the bond is nonpolar.
Explain how you would calculate the total change in bond energy for the reaction H₂ + Cl₂ → 2HCI. How would you know if the reaction was endothermic or exothermic? State your answer in 3-5
Answer:
The total change in energy is -183 kJ/mol, and the reaction is exothermic.
Explanation:
1st) To calculate the total change in bond energy, it is necessary to calculate the energy of the broken bonds (in the reactants side) and the energy of the formed bonds (in the products side):
• Energy of broken bonds:
H-H: 1 x 432 = 432 kJ/mol
Cl-Cl: 1 x 239 = 239 kJ/mol
Total energy of broken bonds = 432 kJ/mol + 239 kJ/mol
Total energy of broken bonds = 671 kJ/mol
• Energy of formed bonds:
H-Cl: 2 x 427 = 854 kJ/mol
Total energy of formed bonds = 854 kJ/mol
2nd) Now to calculate the total change in bond energy, we have to subtract the Total energy of broken bonds minus the total energy of the formed bonds:
Total change in energy = Total energy of broken bonds - Total energy of formed bonds
Total change in energy = 671 kJ/mol - 854 kJ/mol
Total change in energy = -183 kJ/mol
Finally, the total change in energy is -183 kJ/mol, and the negative sign means that the reaction is exothermic, because
Answer: The total change of the energy is -183 kJ/mol
Explanation:
The way I would calculate the total change in the bond energy in the following steps:
- To calculate the whole change in the bond energy. By calculating the energies of the broken bonds and then the energy of the formed bonds.
-132 kJ/mol + 239 kJ/mol = a total of 671 kJ/mol broken bonds.
-H-CI: 2 x 427 = 854 kJ/mol
-Second to calculate the change in the bond energy we now need to subtract the total energy of the broken bond from the total energy of the formed bonds.
-Change in energy = 671 kJ/mol - 854 kJ.mol
-The total change of the energy is -183 kJ/
- Having the negative, therefore, means the reaction is exothermic.
70 grams of potassium nitrate completely dissolve in a solution at 55°C. The same amount of solute remains dissolved when the temperature of the solution drops to 45°C, until a ____ crystal is added. At this point the excess solute rapidly falls out of the solution.
Explanation:
We form a supersaturated solution. At 45 °C the solution has more potassium nitrate that can be dissolved. The recrystallization of the excess dissolved solute can be started inserting a crystal that is called seed crystal.
Answer: seed
What does the range of a dataset tell us?
A. the value that appears most often in a dataset
B. the difference between the accepted and experimental values
C. the central tendency of the values within a dataset
D. the difference between the lowest and highest values
The range of a data set tells us that the difference between the lowest and highest values (option D).
What is range in statistics?Range in statistics is the length of the smallest interval which contains all the data in a sample i.e. the difference between the largest and smallest observations in the sample.
The range of a data set is a way to measure the central tendency of a data. It is the largest measure or central tendency.
Range describes how well the central tendency represents the data. If the range of a data is large, the central tendency is not as representative of the data as it would be if the range was small.
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-Sulfuric acid, H2SO4, can be neutralized by sodium hydroxide, NaOH. The unbalanced equation is:H2SO4(aq) + NaOH(aq) → Na2SO4(aq) + H2O(l)A student who was asked to balance the reaction wrote the following:H2SO4(aq) + Na2OH(aq) →Na2SO4(aq) + H3O(l)Is this correct? Explain why or why not using what you know about the law of conservation of mass and chemical changes. If necessary, provide the correct balanced equation.- How to balance reactions? include tips
Answer:
No, the student did not balance the equation correctly
The balanced equation of reaction is:
[tex]H_2SO_{4(aq)}\text{ + 2NaOH}_{(aq)}\text{ }\rightarrow\text{ Na}_2SO_{4(aq)}\text{ + 2H}_2O_{(l)}[/tex]Explanation:
The law of conservation of mass states that:
What this simply means in relation to chemical equations is that, there must be the same number of moles of atoms of each element on either side of the reaction
Looking at the equation given by the student, we can clearly see that the correct form of the molecules is not written although we have an equal number of moles shown
Thus, we have the balanced equation of reaction as follows:
[tex]H_2SO_{4(aq)}\text{ + 2NaOH}_{(aq)}\text{ }\rightarrow\text{ Na}_2SO_{4(aq)}\text{ +2H}_2O_{(l)}[/tex]From the above, we can see the balanced equation of reaction
Write the complete ground-state electron configuration of Mn⁴⁺.
The complete ground-state electronic configuration of Mn⁺⁴ is:
Mn⁺⁴: [Ar] 4s⁰ 3d³
The electronic configuration is written according to the following principles:
Aufbau's rulePauling's exclusion principleHund's rule of maximum multiplicityManganese being a d-block element possesses d-orbitals in the electron cloud. There are 25 electrons present in the ground-state configuration.
In order to reach the excited state, electrons will be removed from the ground state. The removal of electrons is centripetal in nature. Initially, 2 electrons will be removed from 4s, followed by the removal of 2 electrons from 3d.
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The combustion of glucose is represented by the following balanced equation:
In order to find limiting and excess reactants, we need to first, set up the equation, and it must be properly balanced:
C6H12O6 + 6 O2 -> 6 H2O + 6 CO2
1 gram of C6H12O6
1 gram of O2
From the balanced equation, we see that the molar ratio between C6H12O6 and O2 is 1:6, this means that 1 mol of C6H12O6 will react with 6 times the number of moles of O2
Now let's find the number of moles of C6H12O6, the molar mass is 180.16g/mol
180.16 g = 1 mol
1 g = x moles
x = 0.005 moles of C6H12O6, now we will need this number of moles times 6 in order to proceed with the reaction
1 C6H12O6 = 6 O2
0.005 C6H12O6 = x O2
x = 0.03 moles of O2
And this amount of moles with the molar mass of O2, which is 32g/mol
32 g = 1 mol
x grams = 0.03 moles
x = 0.96 grams of O2 in 0.03 moles
Since we have more oxygen than what we actually need, Oxygen is in excess and C6H12O6 is the limiting reactant
Calculate the frequency of light that has a wavelength of 16.23 * 10^-9 m.
The frequency of the light that has a wavelength of 16.23 × 10⁻⁹ meter would be 1.84 × 10¹⁶ Hz , as the frequency and the wavelength are inversely proportional to each other.
What is Wavelength?It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.
C = λν
As given in the problem we have to calculate the frequency of the light if the wavelength of light is 16.23 × 10⁻⁹ meter.
The frequency of the light = 3 × 10⁸ / 16.23 × 10⁻⁹
= 1.84 × 10¹⁶ Hz
Thus, the frequency of the light would be 1.84 × 10¹⁶ Hz.
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An experiment was designed to test the hypothesis that peanuts have more energy than a chip. The experiment determines calorimetry of the peanut and the chip, using water to capture the energy of the samples when they were burned. A 10 g sample of chip and a 15 g sample of peanut was burned underneath a metal can that held 50 g of water. A thermometer captured how much the temperature of the water increased. The water increased by 7 degrees for the peanut and 3 degrees for the chip. What error was made?
a The temperatures were read wrong.
b Different amounts of food samples were used.
c The food samples were too similar.
d Different amounts of water were used.
Answer:
b Different amounts of food samples were used.
Explanation:
The mass of the two samples needs to be the same in order for the test to be accurate.
What two properties change that would cause a boiled egg to drop into a container, that’s mouth was smaller than the egg? 1. Temperature 2. Pressure 3. Volume 4. Number of particles
Answer:
2. Pressure
4. Number of particles.
Explanation:
If we drop a boiled egg into a container with a smaller mouth than the egg, we can note a change in the pressure inside the container, because initially, we have the atmospheric pressure inside the container but the egg will impose a different pressure inside; and the number of particles will be affected too because we suppose that the container is exchanging particles with the ambient so we wouldn't have an exact amount of particles in the container because of this exchange dynamic, so if the egg is covering the mouth of the container, the number of particles would be constant.
The answers would be 2. Pressure and 4. Number of particles.
Can I know the answer ？
According to the given statement Mass of one atom of gold in grams is 196.78 g.
What is a atom ?A chemical element is uniquely defined by its atoms, that are small bits of substance. An atom is made up of a core nucleus one and or more negatively charged electrons that orbit it. The positively charged, relatively hefty protons and neutrons that make it up the nucleus may be present.
Who discovered the atom?Up until the 1800s, this idea of tiny, indivisible pieces of matter remained. The contemporary atomic idea was really started by the eminent chemist John Dalton (1766–1844). But his atom was like a rock-solid ball.
Briefing:Molar mass is the weight in grams of one mole of an atom.
1 mole = 6.022×10²³ atoms
Molar mass of Gold (Au)
= mass of an atom × number of atoms
=3.207×10-²²×6.022×10²³
=196.78g.
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The phenolic indicator (ln-OH) has approximately the same pKa as a carboxylic acid. Which H is the most acidic proton in ln-OH? Circle or otherwise indicate the most acidic proton. Explain why that H is the most acidic proton in ln-OH (i.e. what makes its conjugate base well stabilized)?
The most acidic hydrogen atom is the hydrogen atom that have been bonded to the oxygen atom.
What is an acidic proton?
We say that a proton is an acidic proton if the proton is able to leave very easily from the rest of the compound. We know that there are several factors that could make a proton that is found in a molecule to become a labile or an acidic proton. The acidity of a proton largely stem from the fact that electron density between the hydrogen atom and the atom to which it is bonded is weak. As such, the bond is weakened by the lengthening of the bond and a consequent lability of the attached hydrogen atom as discussed here.
In the compounds as shown, the most acidic proton is the proton that is attached to the oxygen atom. This is because, the extensive conjugation in the molecule withdraws electrons from the 0-H bond and this makes the hydrogen atom to become labile or acidic.
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How much heat in kJ is released when 0.677 mol NaOH(soln) is dissolved in water? (ΔH(soln) = –44.5 kJ/mol for NaOH)NaOH(s) rightwards arrow Na+(aq) + OH–(aq) + 44.5 kJ/mol
Explanation:
The dissolution reaction of NaOH is:
NaOH (s) -----> Na⁺ (aq) + OH⁻ (aq) + 44.5 kJ/mol
ΔH(soln) = –44.5 kJ/mol
This reaction is exothermic, because the ΔH is negative. That's why the 44.5 kJ/mol appears in the products side, because heat is being released.
From the ΔH of solution we know that 1 mol of NaOH will realease 44.5 kJ when it dissolves. We have to find the heat released by 0.677 mol of NaOH.
Heat released = 0.677 moles * (-44.5 kJ/mol)
Heat released = - 30.1 kJ
Answer: -30.1 kJ is released when 0.677 mol of NaOH is dissolved.
Which of the following is an element located in group 17?
a) Ne
b) Li
c) Mn
d) Br
Answer:
D- Br
Explanation:
6.50×104 +8.70×105
[?]
? ]×10¹ ?
Answer:
9.35 × 10⁵
Explanation:
6.50x10⁴=6500
8.70×10⁵=870000
65000+ 870000= 935000=9.35 ×10 ⁵
Draw the Lewis structure of hcp. Which of the following statement is incorrect?
Answer:
[tex]H-C\equiv P^{\cdot\cdot_{}}_{}[/tex]
Explanation:
Here, we want to draw the lewis structure of HCP
We have the participating compound as, hydrogen with 1 valence electron, carbon with 4 valence electrons and phosphorus with 5 valence electrons
We would have three bonds between the carbon and the phosphorus, then we have a bond between the hydrogen and the carbon
That would leave a pair of non-bonding electrons on the phosphorus
We have the diagram as follows:
[tex]H-C\equiv P^{\cdot\cdot_{}}_{}[/tex]Now, let us look at the options:
option A is wrong as the bond in a triple bond
option B is correct, there are no lone pairs on C
option C is correct as the C-H bond is a single bond
option D is correct as there is a pair of electron on the phosphorus atom
What impact did cargo ship refrigeration systems have on the banana industry? Refrigeration slows the rate at which food is being spoiled, refrigeration does not affect speed at which the ship moves, refrigeration does not cause ripening, refrigeration does not control the sugar content of bananas?
Answer
Refrigeration slows the rate at which food is being spoiled
Explanation
One of the importance of storing foods at cold temperatures (refrigeration) is to slow the growth of microorganisms, thereby limiting food poisoning while preserving food's nutritional qualities and good taste.
Therefore, the impact the cargo ship refrigeration systems have on the banana industry is:
Refrigeration slows the rate at which food is being spoiled
A piece of magnesium ribbon is reacted with excess hydrochloric acid to produce aqueous magnesium chloride
and hydrogen gas. The volume of the dry hydrogen gas produced is 45.6 milliliters. The temperature of the gas
is 293 K, and the pressure is 99.5 kilopascals.
Balance the given equation using the smallest whole number coefficients.
___Mg(s) + ___HCl(aq) →> ___MgCl₂(aq) + ____H₂(g)
The balanced chemical equation between magnesium and hydrochloric acid is Mg + 2 HCl[tex]\rightarrow[/tex] MgCl₂ + H₂
What is a chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Metals reacts with hydrogen halides to produce metallic halides easily and the reaction evolves hydrogen gas. The balanced reaction of Mg and HCl is written as follows:
[tex]Mg (s) + 2HCl \rightarrow MgCl_{2} (aq)+ H_{2}(g)[/tex]
What is a balanced reaction?A balanced reaction is represented by a chemical equation, in which each elements are equal in number on both side of the reaction. Thus the coefficients of reactants must be in proper stoichiometric ratios.
Metals easily reacts with hydrogen halides such as HCl, HBr, HF etc to form their metal halides. This reaction evolves hydrogen gas. Metals are highly electropositive and they can donate electrons to the electronegative atoms such as Cl.
In the given reaction, there are 2 hydrogens and two chlorines in the product side. Thus We have to multiply HCl by 2. Thus, there will be equal number of hydrogens in both side and similar for Mg and chlorines.
Therefore, the balanced reaction is :[tex]Mg (s) + 2HCl \rightarrow MgCl_{2} (aq)+ H_{2}(g)[/tex]. and the whole number coefficients are 1,2,1,1.
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which atoms has the greatest nuclear charge 7 14N, 6 12C,1 2H or 1 2He
Based on the atomic number of the given elements, the atoms that have the greatest nuclear charge is ¹⁴₇N; option A.
What is the nuclear charge in atoms?The nuclear charge in atoms is the charge in the nucleus due to the presence of the positively-charged protons present in the nucleus of an atom.
The nuclear charge of atoms increases with an increase in the atomic number of the elements.
Hence, for elements in the period table, the size of the nuclear charge increases both down the group and across a period from left to right.
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what are the limiting and excess reactants when 3.22 moles of Al react with 6.96 moles of HBr
Answer
HBr is the limiting reactant
Al is the excess reactant.
Explanation
Given:
Moles of Al = 3.22 mol
Moles of HBr = 6.96 mol
Equation: 2 Al + 6 HBr → 2 AlBr₃ + 3 H₂
What to find;
The limiting and excess reactants.
Solution:
Note: The limiting reactant is the reactant that is completely used up in a reaction, and thus determines when the reaction stops. While the excess reactant is the opposite.
From the given balanced chemical equation;
2 moles of Al require 6 moles of HBr
Therefore, the given 3.22 moles of Al will require (3.22/2) x 6 = 9.66 moles of HBr
Since the given moles of HBr is 6.96 mol not up to 9.66 moles required, then HBr is the limiting reactant and Al is the excess reactant.
HBr is the limiting reactant
Al is the excess reactant.
I need help on this!! it’s due today! will mark brainliest if it’s correct
Nuclear fission causes a neutron to split the isotope U-235 when it collides with its nucleus. When a slow neutron interacts with a heavy nuclide like 235U, nuclear fission can occur (0.025 eV).
What happens when uranium-235 atoms are bombarded by slow moving neutrons?When a slow neutron interacts with a heavy nuclide like 235U, nuclear fission can occur (0.025 eV). If a fission (or splitting apart) occurs, the nuclear material splits into two (on average) about equal fragments that travel away with kinetic energy, producing heat.
Nuclear fission causes a neutron to split the isotope U-235 when it collides with its nucleus. Two or three additional neutrons as well as fission products are released during this fission process. The chain reaction is continued by some of the emitted neutrons. There is significant energy released in every fission reaction.
When a uranium atom divides, additional neutrons are also released. The process keeps repeating again as these neutrons keep crashing into more uranium atoms. This process is called a nuclear chain reaction. This reaction is controlled in nuclear power plant reactors to produce a desired amount of heat.
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Calculate the total energy 2.3 * 10^11 photons of gamma radiation having a wavelength of 3.9 * 10^-12 m
According to the Planck's equation,the total energy of 2.3×10¹¹ photons of gamma radiation is 11.7208×10[tex]^-3[/tex] J.
What is Planck's equation?Max Planck discovered the theory which stated that energy is transferred in the form of discrete packs which are called quanta and thus proposed an equation called the Planck's equation which relates energy and frequency of a photon and is given as, E=hcυ or in terms of wavelength it is ,E=hc/λ.
The equation makes use of a constant which is called the Planck's constant and it's value is 6.626×10[tex]^-34[/tex] Js.
In the given problem, the energy is calculated as, E=6.626×10[tex]^-34[/tex]×3×10⁸/3.9×10[tex]^-12[/tex]=5.096×10[tex]^-14[/tex] J.
Thus,for 2.3×10¹¹ photons it is 5.096×10[tex]^-14[/tex] ×2.3×10¹¹ =11.7208×10[tex]^-3[/tex] J.
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Write formulas or names as appropriate for each of the following acids. 1. Hydroiodic acid 2. Carbonic acid 3. Chlorous acid 4. Sulfuric acid 5. Phosphorous acid 6. HCN (aq) 7. H2C2O4 (aq) 8. HNO2 (aq) 9. H2Cr2O7 (aq) 10. HMnO4 (aq)
ANSWER
The chemical formula of Hydroiodic acid is HI
EXPLANATION
Hydroiodic acid is formed from a reaction between hydrogen and iodine resulting into an aqueous solution of Hydrogen iodide
[tex]\begin{gathered} H^{+_{}}+I^-\rightarrow HI_{(aq)} \\ \end{gathered}[/tex]Hence, the chemical formula of Hydroiodic acid is HI
