Help with four physical chemistry problems for finals

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Physical Chemistry Help!

Homework Statement



Hello TT forum. Finals are coming up!...and i am having a hard time solving these stoooooopid physical chemistry problems. ..any help would be GREAT appreciated! These are the 4 problems i am having a hard time with. I put ======= to separate each problem.
Q1.jpg

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Q2.jpg

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You just don't ask. You try, you tell us what you did, we push you in the right direction.