24.37 3) You inflate your car tires to 2.00 atm pressure at 20°C. After driving

Question

24.37 3) You inflate your car tires to 2.00 atm pressure at 20°C. After driving on the highway, the temperature of your tires goes up to 50°C. What is the pressure in the tires? 4) What does 1.00 L of nitrogen (N2) weigh at 20°C? Hint: you calculated the volume of one mole of gas at 20°C for question 2. One liter is what fraction of this volume? 5) An internal combustion engine burns fuel inside a cylinder. The heat expands the gases in the cylinder and pushes against the piston. If the temperature in the cylinder increases from 300°C to 600°C, how much does the pressure increase? What if the final temperature is 800°C?

Explanation / Answer

Ans. P1V1/T1 = P2V2/T1

V1 and V2 are the same as the volume is constant

P1/T1 = P2/T2

P2 = 2.0 * 323K / / 293K = 2.20 atm

Ans 4. suppose P = 1.0 atm

PV = n R T

V = 1.0 * 0.082 * 293K / 1.0 = 24.026 L

24.026 L of N2 contains 28g

1 L of N2 contains 28/24.026 = 1.16g of N2

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