(CHEM) Mole Review

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²³
• 146
• 4.15
• 1.51x10²⁴

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 are the units for molar mass?

• grams
• amu
• g/mol

• liters

What is the molar mass of Hydrogen Peroxide (H₂O₂)?

• 48 g/mol

• 34.02 g/mol

• 36.5 g/mol

• 35.5 g/mol

The number 6.02 x 10²³, which is the number of particles found in a mole. 

• molar mass
• mole
• Avogadro's number
• hydrate

How many moles are in 19.82 g Mg? 

• 1.23 mol Mg

• 481.70 mol Mg

• 1.00 mol Mg

•  0.82 mol Mg

What is the percent composition of oxygen in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent composition of calcium in CaF₂ (molar mass = 78 g/mol)?

• 24%
• 49%
• 51%
• 65%