Density of air, Chemistry Questions help

  

Show all works for the following problems. Be sure to include the correct significant figures in your answers.8. The distance from B Hall to the Library is 2,112 feet. The average walking speed is 3.0 miles per hour. At this speed, how many minutes will it take you to walk to the library from B Hall?9. (Picture attached)10. The density of air at ordinary atmospheric pressure and temperature is 1.19 g/L. What is the mass in kilograms of the air in a room that measures 12.5 ft x 15.0 ft x 8.0 ft?11. The recommended dosage for pain reliever containing acetaminophen, such as Tylenol*, is 2 tablets taken every 360 minutes. If each tablet contains 500.0 mg of acetaminophen, how many kilograms can be safely taken in a 24-hour period?12. Your car gets an average of 34.0 mi/gal on the highway. Your planned trip will cover 585.5 km of highway driving. How many liters of gasoline will this trip require.
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