1. How many moles of methane gas, are in a storage tank with a volume 1 x 105of at STP? How many grams?
2. An aerosol spray can with a volume of 350 mL contains 3.2 g of propane gas as propellant(C3H8). What is the pressure (in atmospheres) of gas in the can at 20°C?
3. A helium gas cylinder of the sort used to fill balloons has a volume of 43.8 L and a pressure of 1,51 x 104 kPa at 25.0°C. How many moles of helium are in the tank?
4. What final temperature (°C) is required for the pressure inside an automobile tire to increase from 2.15 atm at 0°C to 2.37 atm, assuming the volume remains constant?
5. How many moles of air are in the lungs of an average adult with a lung capacity of 3.8 L? Assume that the person is at 1.00 atm pressure and has a normal body temperature of 37°C.
6. What is the molecular mass of sucrose C12H22O11, What is the molar mass of sucrose in grams per mole?
7. How many grams are in 0.0626 mol of NaHCO3 the main ingredient in Alka-Seltzer tablets?
8. How many moles of sucrose are in a tablespoon of sugar that contains 2.85 g?
9. Aspirin has the formula C9H8O4, How many moles of aspirin are in a tablet weighing 500 mg? How many molecules?
10. Hydrochloric acid is sold commercially as a 12.0 M solution. How many moles of HCl are in 300.0 mL of 12.0 M solution?
11. How many moles of solute are present in the following solutions?
a. 125 mL of 0.20 MNaHCO3
b. 650.0 mL of 2.50 M H2SO4
12. The concentration of cholesterol (C27H46O) in normal blood is approximately 0.005 M. How many grams of cholesterol are in 750 mL of blood?
13. How many grams of solute would you use to prepare the following solutions?
a. 500.0 mL of 1.25 M NaOH
b. 1.50 L of 0.250 M glucose (C6H12O6)
14. How many milliliters of a 0.20 M glucose (C6H12O6) solution are needed to provide a total of 25.0 g of glucose?
15. How many moles of ions are in 2.5 mol of NaCl?
16. How many moles of cations are in 1.45 mol of K2SO4?
17. What is the molecular mass of chloroform if 0.0275 mol weighs 3.28 g?
18. How many moles of ions are in 27.5 g of MgCl2?
19. How many grams are in a mole of each of the following substances?
a. Ti
b. Br2
c. Hg
d. H2O
20. How many moles does each of the following samples contain?
a. 1.0 g of lithium
b. 1.0 g of gold
21. What is the mass in grams of each of the following samples?
a. 0.0015 mol of sodium
b. 0.0015 mol of lead
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