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This week we covered gas laws in chapter 6. Please review this material and complete the following practice problems. Show all calculation setups, including units, for all problems.

1. A sample of methane gas, CH4, occupies 3.25 L at temperature of 19.0 oC. If the pressure is held constant, what will be the temperature be if the volume expands to 10.00 L?

2. A sample of oxygen gas occupies 1.9 L at pressure of 1156 torr. What volume will it occupy when the pressure is changed to 912 torr and temperature remains constant?

3. The pressure of hydrogen gas in a constant volume cylinder is 5.01 atm at 21.0 oC. What will be the pressure if the temperature is raised to 70.0 oC?

4. A 988 mL sample of air is at 852 mm Hg and 34.1 oC. What will the temperature of this gas be, in Fahrenheit, at 955 mm Hg and a volume of 602 mL?

5. A sample of a gas occupies 9850 mL at STP. What volume will the gas occupy at 95 oC and 675 torr?

6. A sample of nitrogen gas occupies 28.5 L at STP. How many moles of nitrogen are present?

7. A 795.0 mL volume of hydrogen gas is collected at 23 oC and 1055 torr. What volume will it occupy at STP?

8. What would the pressure be of 25.0 g of chlorine gas at -10.0 ºC in a 4.50 L container?

9. Calculate the density of CH4 at STP.

10. A volume of 495 mL of argon gas was collected at 21.0 oC and 779 torr. What does this sample weigh?

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