H Chem Final Review

What is the molar mass of Ca(OH)₂?

• 58.10 g/mol

• 73.09 g/mol

• 74.10 g/mol

• 114.18 g/mol

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 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 volume of 2 moles of gas at STP?

• 22.4 L
• 44.8 L
• 11.2 L
• 2 L

Fill in the blanks with coefficient:
PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5
• 1, 6
• 3, 8
• 2,2

 Balance this equation:

__ Al + __ HCl → __ H₂ + __ AlCl₃

• 2, 6, 3, 2
• it is already balanced
• 4, 12, 3, 4
• 2, 1, 4, 5

• Synthesis

• Decomposition

• Single Displacement

• Double Displacement

• Single displacement

• Double displacement

• Combustion

• Synthesis

• Decomposition

• Synthesis

• Combustion

• Double Replacement

When reacting Na with Cl₂, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

• 90.4%

• 104%

• 96.15%

• 1.04%