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Ch.10 - Gases

Chapter 10, Problem 29b

(b) What is the molar volume of an ideal gas at STP?

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Hey everyone in this example, we need to calculate moles of gas present. If the unknown gas has a volume of 60.5 liters at standard temperature and pressure, we should recall that at standard temperature and pressure for any gas. We have 22.4 l Permal of that gas. And so what we're going to do is use this as a conversion factor so that we can take our volume from the prompt 60.5 l And we can cancel out leaders by plugging in the 22.4 L of Gas at standard temperature and pressure for one mole of gas at standard temperature and pressure. And so this allows us to cancel our units of leaders leaving us with moles, which is what we want to answer this question And we're going to get a value equal to 2.70 moles of our gas present. So this is going to complete this example as our final answer. I hope that everything I explained was clear. If you have any questions, leave them down below and I will see everyone in the next practice video.
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You have a gas at 25 C confined to a cylinder with a movable piston. Which of the following actions would double the gas pressure? (a) Lifting up on the piston to double the volume while keeping the temperature constant (b) Heating the gas so that its temperature rises from 25 C to 50 C, while keeping the volume constant (c) Pushing down on the piston to halve the volume while keeping the temperature constant.

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(d) If you measure pressure in bars instead of atmospheres, calculate the corresponding value of R in L-bar/mol-K.

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Suppose you are given two 1-L flasks and told that one contains a gas of molar mass 30 and the other a gas of molar mass 60, both at the same temperature. The pressure in flask A is x atm, and the mass of gas in the flask is 1.2 g. The pressure in flask B is 0.5x atm, and the mass of gas in that flask is 1.2 g. Which flask contains the gas of molar mass 30, and which contains the gas of molar mass 60?

Textbook Question

Suppose you are given two flasks at the same temperature, one of volume 2 L and the other of volume 3 L. The 2-L flask contains 4.8 g of gas, and the gas pressure is x atm. The 3-L flask contains 0.36 g of gas, and the gas pressure is 0.1x. Do the two gases have the same molar mass? If not, which contains the gas of higher molar mass?