Dimensional Analysis

Question 1

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?

Revolt · Accepted Answer

C:

Question 2

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?

Revolt · Accepted Answer

B:

Question 3

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?

Revolt · Accepted Answer

B: 0.45 g

Question 4

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.

Revolt · Accepted Answer

C:

Question 5

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.

Revolt · Accepted Answer

C: 0.0532

Question 6

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)

Revolt · Accepted Answer

A: 1.63 × 10-3 g

Question 7

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

Revolt · Accepted Answer

A:

Question 8

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

Revolt · Accepted Answer

C: No, I used the correct conversion factor, but I did the math wrong.

Dimensional Analysis Answers

More from this Course

TRY EDGENUITY HACKS