1. The problem statement, all variables and given/known data "One way to heat a gas is to compress it. A gas at 1.00 atm at 25.0°C is compressed to one tenth of its original volume, and it reaches 40.0 atm pressure. What is its new temperature?" So, I have: P1 = 1 V1 = 1 T1 = 25 P2 = 40 V2 = 0.1 And I'm looking for T2 The question was multiple choice: 1500K, 919 degrees C, 1500 degrees C, and 1192 degrees C. I'm getting 100 degrees C. 2. Relevant equations I've been using the equation: P1V1 / T1 = P2V2 / T2 This gives me T2 = T1(P2V2)/(P1V1) 3. The attempt at a solution When I put in my numbers, it gives me: T2 = 25 (4/1) = 100 degrees C This isn't one of the options, but I can't see where I have gone wrong. If I convert everything to Kelvin, I get 1192K, which is still not quite right due to the units. Any and all help would be highly appreciated. Am I using the wrong equation, or have I simply missed something?