Unit 7 Test Review

What is the gram-formula mass of Ca₃(PO₄)₂?

• 248 g/mol

• 263 g/mol

• 279 g/mol

• 310. g/mol

The gram-formula mass of NO₂ is defined as the mass of

• one mole of NO₂

• one molecule of NO₂

• two moles of NO

• two molecules of NO

What is the gram-formula mass of (NH₄)₃PO₄?

• 112 g/mol

• 121 g/mol

• 149 g/mol

• 242 g/mol

• 8.0 g

• 16.0 g

• 32.0 g

• 40.0 g

Given the balanced equation representing a reaction:

4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

What is the number of moles of H₂O(g) formed when 2.0 moles of NH₃(g) react completely?

• 6.0 mol

• 2.0 mol

• 3.0 mol

• 4.0 mol

• 1.50 mol

• 2.00 mol

• 6.00 mol

• 4.00 mol

Given the equation representing a reaction:

2C + 3H₂ → C₂H₆

What is the number of moles of C that must completely react to produce 2.0 moles of C_2H_6?

• 1.0 mol

• 2.0 mol

• 3.0 mol

• 4.0 mol

• 0.20 mol

• 5.0 mol

• 15 mol

• 44 mol

What is the number of moles of KF in a 29-gram sample of the compound?

• 1.0 mol

• 2.0 mol

• 0.50 mol

• 5.0 mol

Determine the mass of 5.20 moles of C₆H₁₂ (gram-formula mass = 84.2 grams/mole).

• 5.20 grams

• 84.2 grams

• 438 grams

• 0.062 grams