4-5 Relate moles and mass of pure substances

4-5-1. What is the molar mass of NH₃?
A. 8.00 g/mol
B. 10.00 g/mol
C. 15.02 g/mol
D. 17.03 g/mol

4-5-2. What is the molar mass of Ca(NO₃)₂?
A. 70.09 g/mol
B. 82 g/mol
C. 164.10 g/mol

4-5-3. What is the mass of 2.00 mol NH₃?
A. 20.0g
B. 34.1g
C. 30.0g

4-5-4. How many moles of CH₄ are in 4.00 g of CH₄?
A. 0.249 mol
B. 64.0 mol
C. 0.307 mol

4-5-5. What is the molar mass of sodium sulfate decahydrate?
A. 160.7 g/mol, B. 322.9 g/mol, C. 72.05 g/mol

Students' Honors Projects

Calculating Molar Mass.
4-5-SHP-1. Which of the following has a molar mass of 60.06 g/mol?
A. CaCO₃, B. HC₂H₃O₂, C. none of these

4-5-SHP-2. What is the mass of one mole of CO₂?
A. 28.01 g, B. 30.01 g, C. 44.01g

Converting moles to grams.

4-5-SHP-3. If an experiment calls for 0.500 mol calcium carbonate (CaCO₃), how many grams of pure calcium carbonate do we need?

4-5-SHP-4. If an experiment calls for 0.200 mol acetic acid (HC₂H₃O₂), how many grams of glacial acetic acid do we need?

Converting grams to moles.

4-5-SHP-5. How many moles of acetic acid (HC₂H₃O₂) are present in a 5.00 g sample of pure acetic acid?