Moles Review

How many moles are in 50.0 g of water (H₂O)?

• 1 Mol

• 2.7 mol

• 2.7 g

• 18 g

What is the mass of 2.5 moles of sodium chloride (NaCl)?

• 145 g

• 58 g

• 100 g

• 23 g

How many moles are in 44.8 L of oxygen gas (O₂) at STP?

• 22.4 L

• 2 Mol

• 1 Mol

• 32 g

What is the volume of 3.0 moles of carbon dioxide (CO₂) gas at STP?

• 67.2 L

• 22.4 L

• 67.2 g

• 44 g

How many atoms of iodine are in a mole of iodine?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

What is the molar mass of C₂H₄O₂?

• 40g
• 50g
• 60g
• 68g

What is the mass of 0.75 moles of (NH₄)₃PO₄?

• 101.75 g
• 121.75 g
• 111.75 g
• 131.75 g

How many molecules are in 32.4 grams of phosphorous pentoxide?

• 1.76 x 10²³ molecules
• 0.29 moles
• 1.76 x 10²² molecules
• 0.29 molecules

What is the empirical formula of a substance with the molecular formula Se₈F₁₂?

• Se₈F₁₂

• Se₂F₃

• Se₄F₃

• SeF

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

• SO

• SO₂

• SO₃

• SO₄