Out of all the questions on my chemistry ISU, I was stuck on these two questions. Can you help me solve them please?
There's answers at the back of the textbook, so I know what the final answer is, but I don't know how to go about doing the questions. So if you could help me solve them and explain briefly what you did, it would be an amazing help. =)

13. How many kilograms of chlorine gas are contained in 87.6 m3 at 290 K and 2.40 atm?
1 m3 = 1000 L.

14. Calculate the volume of 3.03 g of hydrogen gas at a pressure of 560 torr and a temperature of 139 K.

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