Chemistry Chegg Worksheet

ENGR 1540 Worksheet 8 Chapter 3

1. Calculate the molar mass of the following compounds.

a. magnesium phosphate

b. sodium sulfide

c. dinitrogen tetroxide

2. Determine the molar mass of these ceramic materials.

a. HfN

b. ThO2

c. BaTiO3

3. A chemist needs exactly 2 moles of NaOH to make a solution. What mass of NaOH must be used?

4. What mass of ozone (O3) gives 4.5 moles of the substance?5

5. Calculate the mass in the grams of each the following.

a. 2.5 mol of aluminum

b. 1.25×10-3 mol of iron

c. 0.015 mol of calcium

d. 653 mol of neon

6. Calculate the mass in grams of 13.5 mol of

a. vinyl chloride, C2H3Cl, the starting material for a plastic

b. capsaicin, C18H27NO3, the substance that makes red chili peppers “hot”

c. stearic acid, C18H36O2, used in soaps

7. How many moles are present in the given quantities of explosives?

a. 358.1 g trinitrotoluene (TNT), C7H5N3O6

b. 82.6 g nitromethane, CH3NO2

c. 1.68 kg RDX, C3H6N6O6

8. How many H atoms are present in 7.52 g of propane, C3H8?

9. How many O atoms are present in 214 g of mannose (C6H12O6)?

10. A sample of H2C2O4·2H2O of mass 3.35 g is heated to drive off the waters of hydration (designated separately in the chemical formula). What mass of H2C2O4 remains once the water has been removed by heating?