Ch. 11 extra practice questions.docx

# Hint use the combined gas law and make sure all

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Hint: Use the combined gas law and make sure all temperatures are in kelvins.) 45) A 0.12-mol sample of nitrogen gas occupies a volume of 2.55 L. What is the volume of 0.32 mol of nitrogen gas under the same conditions? 47) A balloon contains 0.128 mol of gas and has a volume of 2.76 L. If an additional 0.073 mol of gas is added to the balloon, what is its final volume? ( Hint: The final number of moles is the sum of the initial number and the amount added.) The Combined Gas Law

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51) A sample of gas with an initial volume of 28.4 L at a pressure of 725 mm Hg and a temperature of 305 K is compressed to a volume of 14.8 L and warmed to a temperature of 375 K. What is the final pressure of the gas? 53) A scuba diver takes a 2.8-L balloon from the surface, where the pressure is 1.0 atm and the temperature is 34 °C, to a depth of 25 m, where the pressure is 3.5 atm and the temperature is 18 °C. What is the volume of the balloon at this depth? 55) A gas sample with a volume of 5.3 L has a pressure of 735 mm Hg at 28 °C. What is the pressure of the sample if the volume remains at 5.3 L but the temperature rises to 86 °C? The Ideal Gas Law 59) What is the volume occupied by 0.255 mol of helium gas at 1.25 atm and 305 K? 61) A cylinder contains 28.5 L of oxygen gas at a pressure of 1.8 atm and a temperature of 298 K. How many moles of gas are in the cylinder?
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