1. The problem statement, all variables and given/known data 0.20 g of hydrogen gas are held in a rigid container. The temperature of the gas is changed from 200 K to 320 K. How much heat is needed 2) A gas at p = 80kPa and T = 350K has a mass density of 8.65×10−2kg/m3 . find the V_rms 2. Relevant equations E_thermal = 3/2nRT 2) v_rms = √(3k*T)/m 3. The attempt at a solution tried doing this equation and got an answer of 30 which is wrong, not really sure if im even on the right track any guidance is appreciated! im not even sure how to start this problem, im not sure the reason mass density is given, im assuming to find mass but im confused.