Mole Conversions Review

How many moles of magnesium are in 3.01x10²² atoms of magnesium?

• 5.00x10⁴⁴ moles Mg
• 0.050 moles Mg
• 1.81x10⁴⁶ moles Mg
• 5 moles Mg

How many grams of carbon are in 0.63 moles of carbon?

• 3.79x10²³ g C
• .0524 g C
• 7.57 g C
• .800 g C

How many molecules of O₂ are in 0.470 grams of oxygen gas?

• 8.00 molecules O₂
• 8.84x10²¹ molecules O₂
• 7.8 molecules O₂
• 8.842x10²¹ molecules O₂

What is the molar mass of NH₃?

• 17.031 g/mol NH₃
• 17 g/mol NH₃
• 14.007 g/mol NH₃
• 18.99 g/mol

Molar mass is the number of moles of a substance that would have  mass of 1 gram.

• True
• False

How many molecules are in 3.6 grams of NaCl?

• 0.06
• 1.0x10²¹
• 1.3x10²⁶
• 3.7x10²²

Which element has a molar mass of 30.974 g/mol?

• Potassium
• Phosphorus
• Gallium
• Palladium

Copper (Cu) is a transition element used in the making of coins. Calculate the mass in grams of 0.0420 moles of copper.

• 0.00697 g
• 0.252 g
• 2.67 g
• 6.61 g

One mole of a substance has the same number of particles as one mole of any other substance, regardless of what substances are being compared.

• True
• False

Calculate the number of molecules in 4.0 mol H₂O.

• 0.60x10²³ molecules
• 2.4x10²⁴ molecules
• 2.4x10^-23 molecules
• 2.4x10²³ molecules