Mole-volume-mass relationship

What is the molar mass of Mg₃N₂?

• 191.6 g/mol
• 76.64 g/mol
• 38.32 g/mol
• 100.95 g/mol

What is the mass of one mole of (NH₄)₂CO₃?

• 144g
• 138g
• 96g
• 74g

36.0 g of Be contains how many moles?

• 0.25 mol
• 4.0 mol
• 45 mol
• 320 mol

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles
• 0.8 moles
• 7,673.4 moles
• 150 moles

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

What is the percent by mass of oxygen in MgO?

• 20%
• 40%
• 50%
• 60%

A beaker contains 3.0 moles of copper. How many grams of copper are in the beaker?

• 190.7 g

• 21.2 g

• 0.047 g

• 86.3 g

A chemist places 2.50 g of iron on a scale. How many moles of iron are on the scale?

• 139.6 moles

• 22.3 moles

• 0.764 moles

• 0.045 moles

To melt the ice, Cindy throws 455 g of calcium chloride, CaCl₂ on her sidewalk. How many moles of CaCl₂ did she throw?

• 50,500 moles

• 4.10 moles

• 0.244 moles

• 111 moles

Shivani measures out 6.0 moles of epsom salt (MgSO₄) to put in her bath. How many grams of MgSO₄ went in the bath?

• 20 g

• 720 g

• 0.050 g

• 340 g