Mole Quiz

What is the percent composition by mass of nitrogen in the compound N₂H₄ ( gram formula mass = 32g/mol)

• 13%

• 44%

• 88%

• 93%

Given the balanced equation for the reaction of butane and oxygen:

2C₄H₁₀ + 13O₂ -----> 8CO₂ + 10H₂O + energy

How many moles of carbon dioxide are produced when 5.0 moles of butane react completely?

• 5.0 mol

• 10. mol

• 20. mol

• 40. mol

A solution contains 25 grams of KNO3 dissolved in 200. grams of H2O. Which numerical setup can be used to calculate the percent by mass of KNO3 in this solution?
 

• 1

• 2

• 3

• 4

Which formula is an empirical formula?

• N₂O₄

• NH₃

• C₃H₆

• P₄O₁₀

What is the gram-formula mass of Ca(OH)₂?

• 29 g/mol

• 54 g/mol

• 57 g/mol

• 74 g/mol

What is the chemical name for Na₂SO₃?

• sodium sulfite

• sodium sulfate

• sodium sulfide

• sodium thiosulfate

What is the mass of 1.5 moles of CO₂?

• 66 g

• 44 g

• 33 g

• 29 g

When given the balanced equation:

2CO(g) + O₂(g) ----> 2CO₂(g) + heat

How many moles of O₂(g) is required to completely react with 28 moles of CO(g) during this reaction?

• 14 mol

• 28 mol

• 17 mol

• 56 mol

What is the gram-formula mass of the magnesium sulfate heptahydrate?

• 230 g/mol

• 138 g/mol

• 246 g/mol

• 122 g/mol

The total quantity of molecule contained in 5.6 liters of gas at STP is

• 1.0 mole

• 0.75 mole

• 0.50 mole

• 0.25 mole