Need help on Chemistry Homework

Posted on 2014-03-25 08:45:00 in Chemistry by CHARLIE

1. Heptane, C7H16 is a compound found in gasoline. Heptane vaporizes, mixes with oxygen and burns in the car’s cylinders. The products are carbon dioxide and water vapor. Write a balanced equation for the combustion of heptane. Calculate how many liters of oxygen are needed to complete the combustion of 90.0L of heptane gas at STP.



2. A weather balloon with an instrument package attached is filled with 15 L of helium gas. The temperature and pressure on the ground are 23ºC and 1.07 atmospheres. What will be the balloon’s volume when it rises high into the atmosphere where the air temperature is -27ºC and the air pressure is only 0.44 atmosphere?



3. Calculate the volume of 3.00 moles of CO2 gas at 200 kPa and 200ºC.



4. What will be the volume of 24.0g of He at –20ºC and 0.42 atm?



5. What will be the volume of 5.69 x 1025 molecules of CH4 at 70ºC and 800mmHg?



6. A certain sulfur oxide gas has a density of 2.38g/L at 75.0 kPa pressure and 30.0ºC. What is the molar mass of the gas? Is the gas SO2 or SO3?



7. Calculate the density of O2 gas at 100 kPa and 10ºC.



8. The density of air at 25ºC and 1atm pressure is about 1.19 g/L. Which of the following balloons will float in air, and which will sink to the floor at 25ºC and 1 atm? Assume that the balloon itself is weightless.

N2 b. CH4 c. CO2 d. Ne

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