Chemistry Final Exam Review- MOLES

What is the molar mass of CO₂?

• 12

• 16

• 32

• 44

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

What is the mass of 2.50 mol of oxygen gas O₂?

• 40 g

• 80 g

• 16 g

• 32 g

How many water molecules are in 5.2 moles of water?

• 6.02 x 10²³

• 5.2

• 3.1304 x 10²⁴

• 8.638 x 10^-24

How many moles are present in 32.3 grams of carbon dioxide (CO₂)?

• 44.01 moles

• 1421.52 moles

• 32.3 moles

• 0.73 moles

How many atoms of carbon are in 6.00g of carbon?

• 1.20x10²⁴atoms C

• 6.02x10²³atoms C

• 3.01x10²³atoms C

• 1.50x10²³atoms C

How many grams are in 1.2 x 10²⁴ molecules of CO?

• 28 grams

• 56 grams

• 6.02 grams

• 1.2 grams

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.05 moles

• 1.81 x 10⁴⁶ moles

• 5.00 x 10²¹ moles

• 5 moles

What is the percent composition by mass of oxygen in the?

• 20%

• 27%

• 46%

• 53%

What is the percent by mass of magnesium in MgO?

• 20%

• 40%

• 50%

• 60%