AnswersLA-Chemistry AStoichiometric Calculations

Stoichiometric Calculations Answers

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The molar mass of iron (III) oxide (Fe2O3) is 159.7 g/mol. What is the correct way to write the molar mass of iron oxide as a conversion factor?

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Option
B
Option
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Option
D
Option
2
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The correct calculation is shown below.Did you perform the calculation correctly?

Question illustration
A
Yes, I answered it correctly.
B
No, I used the wrong conversion factor.
C
No, I used the correct conversion factor, but I did the math wrong.
3

The molar mass of aluminum oxide (Al2O3) is 102.0 g/mol. What is the correct way to write the inverted molar mass of aluminum oxide as a conversion factor?

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Option
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Option
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Option
D
Option
4

What is the mass of 1.84 mol NaCl? Give your answer to the correct number of significant figures. (Molar mass of NaCl = 58.44 g/mol)1.84 mol NaCl = g NaCl

Answer:

108

5

What is the mass of 0.513 mol Al2O3? Give your answer to the correct number of significant figures. (Molar mass of Al2O3 = 102.0 g/mol)0.513 mol Al2O3 = g Al2O3

Answer:

52.3

6

The molar mass of water (H2O) is 18.02 g/mol. Yun has 0.025 mol of H2O for a laboratory experiment. How many grams of water does she have?

A
0.025 g
B
0.45 g
C
0.90 g
D
18 g
7

How many moles of water (H2O) are present in a beaker containing 45.9 g H2O? Give your answer to the correct number of significant figures. (Molar mass of water = 18.02 g/mol)45.9 g H2O = mol H2O

Answer:

2.55

8

Calculate the number of moles in 75.0 g of dinitrogen trioxide (N2O3).

A
0.987 mol
B
1.24 mol
C
1.63 mol
D
1.70 mol
9

Consider again the thermite reaction. If 0.0257 g Al react completely, what mass of Fe forms? Use the periodic table to find molar masses.Fe2O3 + 2Al Al2O3 + 2FeSelect the correct setup for this calculation.

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10

Consider again the thermite reaction. If 0.0257 g Al react completely, what mass of Fe forms? Use the periodic table to find molar masses.Fe2O3 + 2Al Al2O3 + 2FeThe correct setup allows you to cancel terms to yield the mass of iron:What mass of Fe forms? Make sure to give your answer with the correct number of significant figures.A total of 0.0257 g Al forms g Fe.

Question illustration
A
0.1064
B
1.435
C
0.0532
D
0.213
11

Water (H2O) forms when hydrogen gas (H2) and oxygen gas (O2) react according to the equation below:2H2 +O2 → 2H2OWhat mass of water forms when 1.45 × 10-3 g O2 react completely? (Molar mass of O2 = 32.00 g/mol; molar mass of H2O = 18.02 g/mol)

A
1.63 × 10-3 g
B
8.16 × 10-4 g
C
1.29 × 10-3 g
12

The overall chemical reaction for photosynthesis is shown below:6CO2 + 6H2O C6H12O6 + 6O2What mass of glucose (C6H12O6) can form from 71.89 g CO2? (Molar mass of C6H12O6 = 180.18 g/mol; molar mass of CO2 = 44.01 g/mol)71.89 g CO2 = g C6H12O6

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Answer:

49.05

13

Consider again the reaction for photosynthesis: 6CO2 + 6H2O C6H12O6 + 6O2.Select the correct mole ratio to complete the calculation shown below.

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14

What mass of water is required to react completely with 157.35 g CO2? (Molar mass of H2O = 18.02 g/mol; molar mass of CO2 = 44.01 g/mol)157.35 g CO2 = g H2O

Answer:

64.427

15

The correct calculation is shown below. Did you perform the calculation correctly?

Question illustration
A
Yes, I answered it correctly.
B
No, I used the wrong conversion factor.
C
No, I used the correct conversion factor, but I did the math wrong.
16

What mass of oxygen forms from 71.89 g CO2? Use the periodic table to find molar masses.71.89 g CO2 = g O2

Answer:

52.27

17

What mass of oxygen (O2) forms in a reaction that forms 15.90 g C6H12O6? (Molar mass of O2 = 32.00 g/mol; molar mass of C6H12O6 = 180.18 g/mol)15.90 g C6H12O6 = g O2

Answer:

16.94

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