Answer:
one mole or 31.9
Explanation:
I hope this helps
Photodissociation of ozone (O3) can be described as producing an oxygen atom with heat of formation 247.5 kJ/mol. However, in reality photodissociation yields an oxygen atom that is temporarily in an excited state (O*) with a standard enthalpy of 438 kJ/mol.
O3 + hv → O2+ O^+
H^o: (142.9) (0) 438(KJ/mol)
Required:
What maximum wavelength could cause this photodissociation?
Answer:
0.2193 μm
Explanation:
The reaction showing the Photodissociation of ozone (O3) is given below as:
O₃ + hv --------------------------> O₂ + O⁺
H° (142.9) (0) (438kJ/mol).
The first thing to do here is to determine the change in the enthalpy of the total reaction, this can be done by subtracting the change in the enthalpy of the reactant from the change in enthalpy in the product. Hence, we have:
ΔH° = [438 kJ/mol + 247.5 kJ/mol] - (142.9) = 542.6 KJ/mol.
This value, that is 542.6 KJ/mol will then be used in the determination of the value for the maximum wavelength that could cause this photodissociation.
Therefore, the maximum wavelength could cause this photodissociation ≤ h × c/ E = [ 1.199 × 10⁻⁴]/ 542.6 = 2.193 × 10⁻⁷ = 0.2193 μm
PLEAS EHELPP!!
True or false: lone pairs of electrons around the central atom do not influence the shape
of the molecule.
4. Both vitamins and minerals are called protective foods. (True/False)
Answer:
true
Explanation:
hope this answer helps :)
Answer:
true
Explanation
vitamins and minerals are protective foods
four difference between electrolytic cell and electrochemical cell
Answer:
Electrochemical cells convert chemical energy into electrical energy or vice versa. Electrolytic cell is a type of electrochemical cell in which electrical energy is converted into chemical energy. ... Electrolytic cells consist of positively charged anode and a negatively charged cathode.
I hope it's help
A student, Ken, is given a mixture containing two carbonate compounds . The mixture includes MgCO3 and (NH4)2CO3 . The mixture is 64.16% CO3 is by mass. What is the mass percent of MgCO3 in the mixture?
The mass percent of MgCO3 in the mixture is 18.33%.
In the mixture we have:
MgCO3 + (NH4)2CO3 but the percentage by mass of carbonate CO3 is 64.16%
Hence,
Total mass = 100 grams
Let the mass of MgCO3 = x grams
Let the mass of (NH4)2CO3 = y grams
So we have, x + y = 100 ------------(1)
If the mass of CO3 = 64.16% = 64.16 g
But the molar mass of CO3 = 60 g/mol
Then,
Number of moles of CO3 = 64.16 g/60 g.mol-1 = 1.069 moles
Since we obtained the number of moles of CO3 from CO3 in MgCO3 and (NH4)2CO3.
Therefore,
moles MgCO3 + moles (NH4)2CO3 = 1.069
mass of MgCO3 present/molar mass MgCO3 + mass of (NH4)2 CO3 present/molar mass = 1.069
So,
x/84 + y/96 = 1.069---------(2)
From equation 1;
y =100 - x
x/84 + (100-x)/96 = 1.069
x = 18.33 g
Mass of MgCO3 = 18.33 g
Mass percent of MgCO3 = 18.33%
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Typically, water runs through the baseboard copper tubing and, therefore, fresh hot water is constantly running through the piping. However, consider a pipe where water was allowed to sit in the pipe. The hot water cools as it sits in the pipe. What is the temprature change, (ΔT), of the water if 194.0 g of water sat in the copper pipe from part A, releasing 1238 J of energy to the pipe? The specific heat of water is 4.184 (J/g)⋅∘C.
Answer:
[tex]\Delta T=1.53\°C[/tex]
Explanation:
Hello!
In this case, since the problem is providing mass, energy, and specific heat of water, we can write the following equation that relates them to each other:
[tex]Q=mC\Delta T[/tex]
In such a way, we get rid of both m and C, to solve for the change in temperature:
[tex]\Delta T=\frac{Q}{mC}[/tex]
Now we plug in the data to obtain:
[tex]\Delta T=\frac{1238J}{194.0g*4.184\frac{J}{g\°C} }\\\\\Delta T=1.53\°C[/tex]
Best regards!
4)
The color of your eyes is an example of an inherited trait. These are the traits that are passed down to you from your parents.
How are inherited traits like this passed from parents to their children?
A)
Traits like this are developed over a long period of time.
ht
B)
Traits like this are responsible for the way you look, act, and feel.
ing
42
ols
Traits like this are determined by the genes passed from parents to their
children.
D)
Traits like this are determined by the knowledge passed from parents to
their children
Answer:
Explanation: C
Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction entropy of the following chemical reaction: Round your answer to zero decimal places. N2 O2 yields NO2
Answer:
-122 J/K
Explanation:
Let's consider the following balanced reaction.
N₂(g) + 2 O₂(g) ⇒ 2 NO₂(g)
We can calculate the standard reaction entropy (ΔS°) using the following expression.
ΔS° = Σ ηp × Sf°p - Σ ηr × Sf°r
where,
η: stoichiometric coefficients of products and reactantsSf°r: entropies of formation of products and reactantsΔS° = 2 mol × 240.06 J/K.mol - 1 mol × 191.61 J/K.mol - 2 mol × 205.14 J/K.mol
ΔS° = -121.77 J/K ≈ -122 J/K
Which chemical equation is unbalanced?
A). C+O,, CO,
B). Sr t+ O2 2SFO
C). 6H, + 30, 6H,O
D). H, +H, +O,-→ H,0 + H,O
Answer:
The options in this question are unclear, the clear options are as follows:
A. C + O2 → CO2
B. Sr + O2 → 2SrO
C. 6H2 + 3O2 → 6H2O
D. H2 + H2 + O2 → H2O + H2O
The answer is B
Explanation:
A balanced chemical equation is that equation in which atoms of each elements in the reaction are of equal number on both sides of the equation (product and reactant). To balance a chemical equation, coefficients are used.
In this question, four chemical equations are given as follows:
- C + O2 → CO2
In this equation, atoms of carbon (1) and oxygen (2) are the same on both sides, hence, it is BALANCED.
- Sr + O2 → 2SrO
In this equation, Sr has 1 atom on the reactant side but 2 atoms on the product side. Hence, it is UNBALANCED. The balanced equation will be: 2Sr + O2 → 2SrO
- 6H2 + 3O2 → 6H2O
In this equation, atoms of hydrogen (12) and oxygen (6) are the same on both sides, hence, it is BALANCED.
- H2 + H2 + O2 → H2O + H2O
In this equation, atoms of hydrogen (4) and oxygen (2) are the same on both sides, hence, it is BALANCED.
balance the chemical reaction ___ Al + ___ FeO → ___ Al2O3 + ___ Fe
Answer:
2Al+3FeO→Al2O3+3Fe
Explanation:
Basically, to get this answer, you need to balance the amount of Aluminum to the ammount on the other side which is 2 so you need 2 Al to balance the reaction correct, next you move on to the amount of Oxygen in the reaction, there are three Oxygen’s on the right and one on the left, so you need 3 FeO in order for the Oxygens to be balanced. Now that the Iron is unbalanced on both sides, you need 3 Fe (on the right) in order for the equation to be balanced.
The balanced chemical reaction is [tex]2Al+3FeO[/tex] → [tex]Al_2O_3+3Fe[/tex]
What is a balanced chemical reaction?A balanced chemical equation occurs when the number of atoms involved on the reactants side is equal to the number of atoms on the products side.
To balance a reaction means to make the number of atoms the same on both the reactants and products sides. To do so, coefficients need to be added to the chemical equation.
Hence, the balanced the chemical reaction is [tex]2Al+3FeO[/tex] → [tex]Al_2O_3+3Fe[/tex].
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In sediments and waterlogged soil, dissolved O2 concentrations are so low that the microorganisms living there must rely on other sources of oxygen for respiration. Some bacteria can extract the oxygen in sulfate ions, reducing the sulfur in them to hydrogen sulfide gas and giving the sediments or soil a distinctive rotten-egg odor.
Required:
a. What is the oxidation number of sulfur in these compounds?
b. Write the net ionic equation for the reaction under acidic conditions (H3O+) that releases O2 from sulfate and forms hydrogen sulfide gas. Use water as the reactant In the hall-reaction that describes the formation of oxygen.
Answer:
1) SO₄ ²⁻ : (+6)
H₂S : (-2)
Explanation:
a) Sulfate reducers are widespread in muds and other sediments, water-logged soils, etc., environments that contain SO₄ ²⁻ and become anoxic as a result of microbial decomposition.
Sulfate (SO₄ ²⁻), the most oxidized form of sulfur (+6), is reduced by these
sulfate-reducing bacteria. The end product of sulfate reduction is hydrogen sulfide, H₂S, (oxidation number -2) an important natural product that participates in many biogeochemical processes. The H₂S they generate is responsible for the pungent smell (like that of rotten eggs) often encountered near coastal ecosystems. When sulfate-reducing bacteria grow, the H₂S formed from SO₄ ²⁻ reduction combines with the ferrous iron to form black, insoluble ferrous sulfide, which is not toxic. This is important for the conservation of the environment.
b) The net ionic equation under acidic conditions is:
4 H₂ + SO₄²⁻ + H⁺ → HS⁻ + 4 H₂O
Global reaction: SO₄²⁻ + 2H⁺ → H₂S + O₂
Which of the following does NOT change the amount of resistance to the flow of
electrons in a wire?
Length of the wire
Diameter of the wire
Amount of insulation surrounding the wire
O
The material the wire is made from
Answer:
Amount of insulation surrounding the wire
How many grams are presented in a 7.4 moles sample of H2O?
Answer:
130g
Explanation:
For every mole of a substance, there is a molar mass that coincides with the masses on the periodic table. For one mole of H2O, you would add the molar masses of the two hydrogen atoms and the oxygen atom to get 18.016g. You would then take this molar mass and multiple it by the amount of moles present (7.4) to get 133.3184g
From here, you would round to the significant figures to get 130g
For the reaction CH4 +2O2 = CO2 +H2O
How many grams of water (H2O) are produced from the combustion of 6.35 moles of methane (CH4)? Please show all work.
reaction
CH₄ + 2 O₂ ==> CO₂ + 2 H₂O (Equal)
first, let's count the mole of H₂O that formed
mole H₂O = (coefficient of H₂O / coefficient of CH₄) x mole CH₄
mole H₂O = (2/1) x 6,35 mole
mole H₂O = 12,7 mole
so
Mass H₂O = mole H₂O x Molecular Mass
Mass H₂O = 12,7 mole x 18 ((2 x Ar H) + Ar O)
Mass H₂O = 228,6 g
HELP.....From the information presented in the activity series of metals below (4 metals included), answer the following question.
In a single replacement reaction, would aluminum replace magnesium to form a new compound or would there be no reaction?
------------------------------------
magnesium (most reactive)
aluminum
zinc
iron (least)
a)there would be no reaction
b) aluminum would replace magnesium to form a new compound
Answer:
a)there would be no reaction
Explanation:
The activity series of metals has many functions. The one applicable to this problem is that it can be used to determine whether a reaction will occur or not. Also, based on the positions of metals in the series, we can know how reactive a metal is compared to another.
In a single displacement reaction, a metal replaces another metal based on their position on the activity series. Metals that are higher in the series are generally more reactive than others below them and so will displace them.
Would aluminum replace magnesium to form a new compound or would there be no reaction?
Magnesium is higher than aluminum in the activity series. Therefore it is more reactive than aluminum. No reaction will occur.
10 points
How many elements are PbSO4?
Answer:
I believe the answer is three: Lead, sulfur, and oxygen
Explanation:
Chemistry student measured the boiling point of lyric acid to be 40°C the actual boiling point of lyric acid is 43.2°C what is the percent error for this measurement?
The percent error of Chemistry student : 7.4%
Further explanationGiven
40 °C measurement
Required
The percent error
Solution
% Error : difference between the theoretical value and the actual value
or
% Error : Absolute Error / Accepted Value
Absolute Error = Measured Value - Accepted Value
% Error for Chemistry student :
1. Subtract the measurement value with the accepted value
= 40 °C - 43.2 °C
= -3.2 °C
2. Divide by the accepted value, and multiply by 100
= |-3.2/43.2| x 100%
= 7.4%
Why are there few fossils of protists. write a paragraph response
Answer:
protists that produce a hard outer covering have left many fossils, other protists lack hard parts, so few fossils of these organisms have been found. ... Protists in this group are called plantlike because, like plants, they contain the pigment chlorophyll in chloroplasts and can make their own food.
Explanation:
Hope it helps, some how.
how many particles would be found in a 2.1 mol sample of AlPO4?
1.3 × 10²⁴ particles AlPO₄
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
2.1 mol AlPO₄
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 2.1 \ mol \ AlPO_4(\frac{6.022 \cdot 10^{23} \ particles \ AlPO_4}{1 \ mol \ AlPO_4})[/tex]Multiply/Divide: [tex]\displaystyle 1.26462 \cdot 10^{24} \ particles \ AlPO_4[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1.26462 × 10²⁴ particles AlPO₄ ≈ 1.3 × 10²⁴ particles AlPO₄
It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium.
a. True
b. False
It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium is false it takes less than 14 billion years to completely burn through its fuel.
What does red dwarf star mean?A red dwarf is one of the smallest and coldest stars on the main sequence. As red people are the most common type of star in the Milky Way, at least in the vicinity of the Sun, but because of their low luminosity, people cannot be easily observed.
In the solar core, the temperature and density are gigantic and cause nuclear fusion of hydrogen into helium. Four hydrogen atoms fuse to form a helium atom. And this fusion is an incredible way to produce energy.
See more about red dwarf at brainly.com/question/25981690
Is acid rain a global or a regional concern ?
Explanation:
Acid rain is linked to both natural and man-made sources. Nitrogen oxides are formed through the extreme heating of air when a thunderstorm produces lightning. ... For this reason, acid rain is considered a global problem
Answer:
Acid rain is a global concern.
Explanation:
The effects of acid rain have reached dramatically mainly in the industrialized countries which fall on global ecology.
help please, please,please. ....
Answer:
the answer is nitrogen
Explanation:
u can right this for explain your answer-
( nitrogen is unreactive
nitrogen doesn't support burning )
orrrrr
(contains no oxygen
all the other jars contain oxygen)
Consider the following data:
HfCo2 = -393.5 kj/mol
HfH20 = -241.82 kj/mol
Hfc2h6 = -84.68 kj/mol
Using these data, calculate Delta HRXN
for this chemical reaction. Round to the nearest whole number.
2C2H6(g) + 7O2(g) -> 4CO2(g) + 6H2O(g)
Answer:
if you ask yahoo answers it will tell you
Explanation:
hope i helped
Answer:
-2856
-792
endothermic, exothermix, exothermic, endothermic
no
Explanation:
HELP PLEASE ANSWER PLEASE ITS URGENT!!
-unnecessary comments will be reported.
Answer:
19. 1, 2, 3, 4, 5, 6, 7, 8
20. Li=1+, Be=2+, B=3+, C=4+
21. N=3-, O=2-, F=1-
Explanation:
You want to plate a steel part having a surface area of 240 with a 0.002--thick layer of silver. The atomic mass of silver is 107.868 . The density of silver is 10.49 . How many atoms of silver are required
This question is incomplete, the complete question is;
You want to plate a steel part having a surface area of 240 in² with a 0.002-in thick layer of silver.
The atomic mass of silver is 107.868 g/mol .
The density of silver is 10.49 g/cm³.
How many atoms of silver are required?
Answer:
4.6 × 10²³ atoms of silver are required
Explanation:
Given the data in the question;
first, we determine the volume of silver layer
volume of silver layer = surface area × thickness
we substitute
volume of silver layer = 240 in² × 0.002-in = 0.48 in³
we know that 1 in³ = 16.387 cm³
so, volume of silver layer = 0.48 × 16.387 = 7.87 cm³
Next we calculate mass of silver;
⇒ density × Volume
mass of silver = 10.49 g/cm³ × 7.87 cm³ = 82.5563 g
Now, number of atoms of silver are required will be;
Number of atoms = (mass/atomic mass) × Avogadro number
we know that A.v no. is 6.02214 × 10²³ mol⁻¹
so
Number of atoms = (82.5563 g / 107.868 g/mol . ) × 6.02214 × 10²³ mol⁻¹
= 0.7653 × 6.02214 × 10²³
= 4.6 × 10²³ atoms
Therefore; 4.6 × 10²³ atoms of silver are required
At what temperature will 7.2 moles of a gas under 107.5 kPa of pressure that takes up 748 cm^3 be?
The temperature = T = 1.29 K
Further explanationGiven
n = 7.5 moles
P = 107.5 kPa = 1,0609425 atm
V = 748 cm³ = 0.748 L
Required
Temperature
Solution
Ideal gas law :
PV = nRT
T = (PV)/(nR)
T = (1,0609425 x 0.748)/(7.5 x 0.08205)
T = 1.29 K
Please help me ASAP I’ll mark Brainly
Answer:
Electrical, heat, and light
Explanation:
B. Each atom is neutrally charged, which means that each atom has the same number of protons and
electrons. Based on this, how many protons are in each atom?
Sodium
Chlorine
How many grams of Mg are needed to produce 224 g of MgO in the complete reaction of Mg
with oxygen gas?
Answer:
134.4 g of Mg
Explanation:
reaction:
2Mg + O2 ➡️ 2MgO
1) find the mol of MgO
mol = mass / molar mass
mass = 224 g
molar mass = 24+16 = 40
mol = 224 / 40
= 5.6 moles
2 mol = 5.6 moles
2) find the mass of Mg
mass = mol × molar mass
mol = 5.6
molar mass = 24
mass = 5.6 × 24
= 134.4 g
According to the law of conservation of mass, in any chemical change:
the mass of reactants is greater than the mass of products
O the mass of reactants is less than the mass of products
the mass of reactants is equal to the mass of the products
the masses of products and reactants have no predictable relationship
Answer:
The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. ... The carbon atom changes from a solid structure to a gas but its mass does not change. Similarly, the law of conservation of energy states that the amount of energy is neither created nor destroyed.
The correct statement is 'the mass of reactants is equal to the mass of the products'.
Explanation:
The law of conservation of mass states that 'in chemical reaction mass can neither be created nor be destroyed.According to this law total mass of reactant before chemical reaction is eqaul to total mass of the products after the chemcial reaction.The number of atoms of taking part in chemical remains the same before and after the course of chemical reaction.So, from this we can conclude that the from the given statements the correct statement is 'the mass of reactants is equal to the mass of the products'.
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