Mole Concept Quiz

How many moles of 98.3 grams of Al(OH)₃?

• 1.26 moles

• 0.80 mole

• 15.0 moles

• 7673.4 moles

Convert 25 grams of NaBr to molecules.

• 1.45 x 10²³ molecules

• 102.96 molecules

• 0.24 molecules

• 2.34 x 10²⁰ molecules

What is the empirical formula for the compound, CxHyOz, if the ratio C: H: O equal to 2: 2.5 : 1?

• CHO

• C₂H₄O₄

• C₄H₅O₂

• C₂H₂.₅O₁

The empirical formula for hydrocarbon A is C2H7O. If the molar mass of the hydrocarbon is 141 g/mol, determine the molecular formula for this hydrocarbon.

• C2H7O

• C2H7O4

• C2H3O

• CH7O

Molarity is .....

• mole of solute in 1 kg solvent

• mole of solute in 1 L solution

• mole of solute in 1 kg solution

• None of above

The ratio of the mass of solute over mass of solution multiplied by 100 is

• Percentage by volume

• Percentage by mass

• Percentage yield

• Theoretical yield

Standard temperature and standard pressure are referring to:

• 273 K and 1 atm

• 0 K and 1 atm

• 273 K and 0 atm

• 298 K and 1 atm

What volume is occupied by 9.50 moles of carbon dioxide gas at room temperature and pressure?

• 212.8 L

• 228 L

• 2.53 L

• 2.36 L

How many total liters of gas can be produced at STP if 9.0 grams of aluminum metal react with 200 mL of 10.0 M HCl?

2 (Al)s + 6H⁺(aq) → 2Al³⁺(aq) + 3H₂(g)

• 3.0 L

• 2.5 L

• 11.1 L

• 4.1 L

A balanced chemical equation allows one to determine the:

• Energy released in the reaction.

• Mole ratio of any two substances in the reaction.

• Electron configuration of all elements in the reaction.

• Mechanism involved in the reaction.