Stephanie M. answered 05/17/15
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All of these problems involve using the Combined Gas Law, which states:
(p1V1)/T1 = (p2V2)/T2,
where p1, V1, and T1 are the initial pressure, volume, and temperature of a gas and p2, V2, and T2 are the pressure, volume, and temperature after some change is made to the gas.
All of these problems just give you five of those values and ask you to solve for the sixth. The first problem, for example, tells you that, initially, V1 = 20.4 mL, p1 = 558 mm Hg, and T1 = 25.2 C. It tells you that, after some change, V2 = 56.8 mL and T2 = 55 C. It asks you to solve for p2. You'll just need to plug in those numbers and solve.
Each problem works the same way. Just be careful to keep an eye out for changing units. In problem 2, for example, you're given T1 in C and asked for T2 in K. Just find T2 in C and then convert to K.