# San Diego State University Compute the Atmospheric Pressure Chemistry Questions

A tire has a volume of 20.0 L at 24.0 ºC and a pressure of 1550 kPa. The tire’s temperature increases to 30.0 ºC. What is the new pressure in the tire if the volume is constant?

Calculate the decrease in pressure when a 293.0 K sample of gas at 760.0 mmHg is cooled to 250.0 K.

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• Helium at a 1.07 atm of pressure and a volume of 7.0 L is placed into a small can with a volume of only 4.0 L. Assuming temperature is constant, what is the pressure of gas inside of the can?
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• The weather news gives the atmospheric pressure as 750.0 mmHg. What is the atmospheric pressure in kPa?

Calculate the pressure of 0.034 moles of methane gas (CH4) sealed in a 0.80L flask at room temperature (295 K).

Helium at a 1.00 atm of pressure and a volume of 5500 mL is places into a small can with a volume of only 475 mL. Assuming temperature is constant, what is the pressure of the gas inside the can?

• A sample of gas at 58ºC has a volume of 3.42 L. What will the new volume of a gas sample at 8.0 ºC be if its volume at Assume the pressure is constant.
• When a cylinder of nitrogen is left standing in the sun, the temperature of the gas reaches 42ºC. The cylinder has a pressure of 12 atm and contains 120 grams of nitrogen (N2). What is the volume inside the cylinder?
• A gas thermometer measures temperature by measuring the pressure of a gas inside the fixed volume container. A thermometer reads a pressure of 255 kPa at 10.0 ºC. What is the temp in kelvin when the thermometer reads a pressure of 345 kpa?
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