At the end of an experiment your expected amount of product was 35 grams, but you only produced 32 grams. Calculate the percent yield (% yield)
Answer:
the answer is I'm pretty that it's
Explanation:
Ur Wellcome
Uranium–232 has a half–life of 68. 9 years. A sample from 206. 7 years ago contains 1. 40 g of uranium–232. How much uranium was originally present? g.
Half-life can be given as the time required by the substance to reduce to half of its original concentration. The original mass of Uranium was 11.2 grams.
What is the expression of half-life?
The half-life for the reaction can be expressed as;
[tex]A_t=A_0(\dfrac{1}{2})^\dfrac{t}{t1/2}[/tex]
Where the final mass of the product is, [tex]A_t=1.40\;\rm g[/tex]
The time for the reduction is given as, [tex]t=206.7\;\rm years[/tex]
The half-life of the compound is given as, [tex]t1/2=68.9\;\rm years[/tex]
The original concentration ([tex]A_0[/tex]) of the Uranium is given as,
[tex]\rm 1.40\;g=\textit A_0(\dfrac{1}{2} )^{\dfrac{206.7}{68.9}}\\\\1.40\;g= \textit A_0(\dfrac{1}{2} )^3\\\\\textit A_0=11.2\;\rm grams[/tex]
The original mass of uranium-232 has been 11.2 grams.
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how many liters of neon gas will 3.55 mol occupy at STP?
STP (Standard Temperature and Pressure):
At STP, 1 mole of an ideal gas will occupy a volume of 22.4 liters (Note: the new defined STP volume is 22.7 liters).
The volume is 77 L .
3 moles of oxygen at STP will occupy a volume of 3×22. 4=67. 2 L.
1.5 moles of oxygen at stp = 22.4 x 1.5 = 33.6 litres.
Therefore , number of moles of oxygen is : Now , we know volume of 1 mole of gas at S.T.P is 22.4 liters . Therefore , volume of 0.1 mole of oxygen at S.T.P is : Therefore , the volume of 3.2 gram atom of oxygen at S.T.P is 2.24 liters .
Helium is the largest, so that’s going to have the largest volume. Because at STP, volume was going to be equivalent to moles of gas.
Therefore, chemists introduced the concept of molar volume. Molar volume of a gas is defined as the volume of one mole of the gas. Thus, the molar volume is also the volume occupied by 6.02 x 1023 particles of gas. The molar volume of any gas is 22.4 dm3 mol–1 at STP or 24 dm3 mol–1 at room conditions.
oxygen gas
One mole of oxygen gas occupies 22.4 l volume at STP.
67.2 liters
The answer depends on the temperature and pressure. If the gas is at STP, THE 1 mole is 22.4 liters. 3 moles x 22.4 L/mol = 67.2 liters.
Well, assuming that the hydrogen gas is contained at STP , then the molar volume would be 22.7⋅3=68.1 L .
0.5 moles⋅22.4 L/mol=11.2 L , and so on.
The molar volume of any gas at S.T.P. is 22.4L .
So, the volume of an ideal gas is 22.41 L/mol at STP. This, 22.4 L, is probably the most remembered and least useful number in chemistry.
At STP, one mol of Ideal Gas occupies 22.4 L and one mmol of Ideal Gas occupies 22.4 mL.
PLEASE HELP ME OUT!!!
If you put 3 grams of H2 gas and 2 grams of F2 gas into a 2.5L tank and seal it at 283.15K what is the pressure inside the tank?
Solve this problem by doing it this way.
1 calculate the moles of H2 and F2 gas by using the periodic table.
2 Use the ideal gas law to calculate the pressure inside the tank from Hydrogen
3 Use the ideal gas law to calculate the pressure inside the tank from Fluorine.
4. Add the two pressures together to get the total pressure.
Hint the answer is greater than 1000 and less than 3000
Answer:
4
Explanation:
hope it helps you in the long run
Salicylamide can undergo an iodination by electrophilic aromatic substitution. Arrange the procedural steps in order to iodinate salicylamide.
The procedural steps in order to get iodinate salicylamide are as follows:
It begins first at a laboratory.Secondly, one has to dissolve salicylamide in ethanol.Then one has to add sodium iodide.Later on, one has to add sodium hypochlorite to the ice cold solution of salicylamide and sodium iodide.Thereafter one has to sodium thiosulfate.It is better to Acidify by a person adding about 10% of HCl.The one has to collect the crude product through the use of vacuum filtration.Lastly one then Recrystallize from hot ethanol.What is Electrophilic aromatic substitution?The Electrophilic aromatic substitution is known to be a kind of an organic reaction where an atom is said to be added or attached to a kind of aromatic structure (that is made up of hydrogen) is said to be replaced by an electrophile.
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A wave has frequency of 50 waves per second (Hz) and a wavelength of 10 m. What is the speed of the wave?
Answer:
500 m/s
Explanation:
Wave Speed=Frequency x Wavelength
=50x10
=500
Which of the following is NOT a property of Alkali Metals?
A) They form ions with a charge of +2.
B) They are lustrous.
C) They are extremely reactive with water.
D) They are good conductors of heat and electricity.
Previous
Answer:
Which of the following is NOT a property of Alkali Metals?
A) They form ions with a charge of +2.
B) They are lustrous.
C) They are extremely reactive with water.
D) They are good conductors of heat and electricity. Previous
Explanation:
The Answer is D.
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help this kid , please ╮(╯_╰)╭
Answer:
1)
[tex]24 \times 60 \times 60 \\ 86400[/tex]
The calculated amount of product that should ideally be produced in a chemical reaction is called the
A) true yield
B) theoretical yield
C) actual yield
D) percent yield
Answer:
Theoretical yield
Explanation:
hope this helps :)
Answer : B) theoretical yield
percent yield = Actual yield : theoretical yield x 100%
actual yield = actual product
theoretical yield = the product that should be produced (from the calculation of the reaction coefficient)
how would I put this into words C2H7OH + O2 ---> CO2 + H2O
Answer:
My Understanding:
Explanation:
2 Carbon, 7 Hydrogen, 1 Oxygen, 1 Hydrogen plus 2 Oxygen is the reactants of 1 Carbon, 2 Oxygen plus 2 Hydrogen, and 1 Oxygen.
6. If the broken wire of the top branch
is connected, what will be true of the
lightbulbs? sc.6.P.13.1
A All of the bulbs would be lit.
B
None of the bulbs would be lit.
C Only the top bulb would be lit.
D Only the top two bulbs would be lit.
I NEED THIS !!
Answer: When two light bulbs are connected in parallel, which is true? A. The total resistance is less than the resistance of either bulb alone. B. The Voltage provided
Explanation:
Answer:
D. Only the top two bulbs would be lit.
Explanation:
When you connect the top light bulb, both the top and middle light bulbs will be lit. But, the bottom light bulb will not be lit because it is not connected. In order for a light bulb to be lit, it has to be connected on both sides by wire.
< Hope this helps! :)
Potential energy is what
Answer:
the energy possessed by a body by its value of its position relative to others, stresses within itself, electric charge, and other factors.
Explanation:
Help!!! I am not sure its a chemistry question : A student in chemistry class mixes two chemicals together and observes bubbling and the beaker getting warmer. Which of the following would NOT provide the student with evidence that a chemical reaction has occurred?
Question options:
Mixing chemicals always leads to a chemical change.
Heat indicates that an energy change is occurring.
Bubbling represents a gas being produced.
A new substance is being formed.
Answer:
A
Explanation:
Mixing chemicals does not always lead to a chemical change.
Mixing chemicals always leads to a chemical change would not provide the student with evidence that a chemical reaction has occurred.
What is chemical reaction ?In a chemical reaction, one or more substances also known as reactants are changed into one or more additional substances also known as products. Chemical elements or chemical compounds make up substances.
When substances or compounds undergo a chemical transformation to create new substances or compounds, a chemical reaction takes place. Chemical equations use symbols and the chemical formulae of the molecules involved in the reaction to express chemical processes.
Cells, animals, people, and insects may all grow, develop, reproduce, and adapt thanks to chemical processes.
Thus, option A is correct.
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Ammonia gas decomposes to form nitrogen and hydrogen gases. NH3(g) → N2(g) 3H2(g) If the nitrogen gas is collected in a rigid 2 liter metal cylinder at 22oC at 2000 kPa pressure, how many moles of nitrogen gas (N2) does the cylinder contain?.
Decomposition is a chemical reaction that breaks the reactant into two or more products. Moles of nitrogen gas [tex](\rm N_{2})[/tex] in the cylinder is 1.63 moles.
What is the ideal gas equation?The ideal gas equation states the relation of the hypothetical ideal gas according to the pressure, volume, temperature and moles of the gas. It is given by,
[tex]\rm PV = nRT[/tex]
Where,
Pressure (P) = 2000 kPa
Volume (V) = 2L
Temperature (T) = 295 K
Gas constant (R)= 0.08206
Substituting values in the equation:
[tex]\begin{aligned} \rm n &= \rm \dfrac{PV}{RT}\\\\&= \dfrac{2000 \times (\dfrac{1}{101.325}) \times 2}{0.08206 \times 295}\\\\&= 1.63\;\rm mol\end{aligned}[/tex]
Therefore, 1.63 moles are produced.
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Answer:
1.63 moles.
Explanation:
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Explain how potassium forms an ionic compound with sulfur. Include the ions they would form and how
many ions of each element would be needed to form a neutral ionic compound.
Answer:
You need two potassium atom to form an ionic bond with one sulfur atom. Pottassium ions are formed by donating losing their electrons in the outermost shell, thr lost electrons are gained by sulphur atom to form 2K+ and S2-, respectively. The attraction between the positive ions and negative ions gives rise to the ionic bond and the molecular formula is K2S
Explanation:
3. The diet of white-tailed deer consists primarily of shrubs. Sika are
another species of deer that eat both grasses and shrubs. After an
extended drought period, why might the Sika population be favored ove
the white-tailed deer population?
Sika requires less food than do the white-tailed deer.
Sika require more water than do the white-tailed deer.
Sika have more food sources than do the white-tailed deer.
Sika have fewer food sources than do the white-tailed deer.
W(OH)2 + 2 HCl → WCl2 + 2 H2O
How many grams of W(OH)2 are needed to react with 150 grams of HCl?
(MM W(OH)2 = 217.855 g/mol) (MM HCl = 36.461 g/mol)
Group of answer choices
448.126 grams HCl
50.209 grams HCl
50.209 grams W(OH)2
448.126 grams W(OH)2
The amount of W(OH)2 needed would be 448.126 g
Stoichiometric calculationFrom the equation of the reaction:
W(OH)2 + 2 HCl → WCl2 + 2 H2O
The mole ratio of W(OH)2 to HCl is 1:2
Mole of 150g HCl = 150/36.461
= 4.11 moles
Equivalent mole of W(OH)2 = 4.11/2
= 2.06 moles
Mass of 2.06 moles W(OH)2 = 2.06 x 217.855
= 448.188g
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what ocurrrs when the vapor pressure of a liquid is equal to the external atmospheric pressure
Answer:
The change from a liquid phase to a gaseous phase.
so the answer would be it changed to a gaseous phase
---------------
This is what occurs when the vapor pressure of the liquid is equal to the atmospheric pressure exerted on the liquid.
Hydrogen ions and PH
Answer:
the more hydrogen ions present, the lower the pH; conversely, the fewer hydrogen ions, the higher the pH.
How many moles are in 223.2 g iron (Fe)?
Answer:
there are 4 moles in 223.2 g Iron (Fe)
How many grams are in 3.14 x 1015 molecules of CO?
Answer:
Explanation:
Not Many
1 mol of CO has a mass of
C = 12
O = 16
1 mol = 28 grams.
1 mol of molecules = 6.02 * 10^23
x mol of molecules = 3.14 * 10^15 Cross multiply
6.02*10^23 x = 1 * 3.14 * 10^15 Divide by 6.02*10^23
x = 3.14*10^15 / 6.02*10^23
x = 0.000000005 mols
x = 5*10^-9
1 mol of CO has a mass of 28
5*10^-9 mol of CO has a mass of x Cross Multiply
x = 5 * 10^-9 * 28
x = 1.46 * 10^-7 grams
Answer: there are 1.46 * 10-7 grams of CO if only 3.14 * 10^15 molecules are in the sample
Which set of four quantum numbers corresponds to an electron in a 4f orbital?.
Answer:
4s
4p
4d
4f
these are the four quantum numbers
Carbon Monoxide is poisonous for us, why?
Answer:
Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen. Large amounts of CO can overcome you in minutes without warning — causing you to lose consciousness and suffocate.
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Calculate the pH of a buffer solution created by reacting 100 mL of 0.1 M NH3 with 90 mL of 0.1 M HNO3. (Remember, you can find Ka and Kb values on gchem!)
This question is asking for the pH of a buffer solution between ammonia and nitric acid, with given volumes and concentrations. At the end, the result turns out to be 10.488.
BuffersIn chemistry, buffers are known as substances attempting to hold a relatively constant pH by mixing and acid and a base (weak and strong). In such a way, for the substances given, the first step will be to calculate the consumed moles as they are mixed:
[tex]n_{NH_3}=0.1L*0.1mol/L=0.01mol\\\\n_{HNO_3}=0.09L*0.1mol/L=0.009mol[/tex]
Now, since ammonia is in a greater proportion, one can calculate how much of it is left after being consumed by the nitric acid:
[tex]n_{NH_3}^{left}=0.01mol-0.009mol=0.001mol[/tex]
And its new concentration:
[tex][NH_3]=\frac{0.001mol}{0.1L+0.09L} =0.00526M[/tex]
Next, with ammonia's ionization:
[tex]NH_3+H_2O\rightleftharpoons NH_4^++OH^-[/tex]
We set up the equilibrium expression based on ammonia's Kb:
[tex]Kb=\frac{[NH_4^+][OH^-]}{[NH_3]}[/tex]
Which can be solved by introducing x and using ammonia's Kb:
[tex]1.8x10^{-5}=\frac{x^2}{0.00526M}\\ \\[/tex]
Then, we solve for x which is also equal to the concentration of ammonium and hydroxide ions in the solution:
[tex]x=\sqrt{0.00526*1.8x10^{-5}}=0.000308M[/tex]
Ultimately, we calculate the pOH and then turn it into pH with:
[tex]pOH=-log(0.00308)=3.512\\\\pH=14-3.512=10.488[/tex]
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Velocity of idealized ocean waves derivation deep water.
Answer:
true
Explanation:
At standard temperature and pressure, what is the volume of one mole of gas?
A. 22.4 liters
B. 0.0821 liters
C. The same as the molar mass of the gas
D. The product of protons, neutrons, and electrons in the gas
Answer:
A. 22.41
Explanation:
goodluck man, just typing a little bit more for the 20 words
Answer:
22.4liters
Explanation: I did it in a quiz.
How many bonds will an atom of bromine usually form in order to reach an octet of electrons?
Answer:State the number of valence electrons for a hydrogen atom and a bromine atom in a covalent bond.
Explanation:
separating mixtures: filtration
hi these are the answers :)
Calculate the volume of an
object with the following
dimensions:
6.0 cm x 8.0 cm x 2.0 cm
What is redox in terms of oxygen? Give an example.
Explanation:
both reduction and oxidation are occurring simultaneously, this is known as a redox reaction. An oxidizing agent is substance which oxidizes something else. In the above example, the iron(III) oxide is the oxidizing agent. A reducing agent reduces something else
The oxygen atoms undergo reduction, formally gaining electrons, while the carbon atoms undergo oxidation, losing electrons. Thus oxygen is the oxidizing agent and carbon is the reducing agent in this reaction.
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