1. The problem statement, all variables and given/known data The density of helium gas at T= 0 degrees Celsius is 0.179 kg/m^3. The temperature is then raised to 100 degrees Celsius, but pressure is kept constant Assuming the helium gas is an ideal gas, calculate the new density of the gas. 2. Relevant equations PV = nRT 3. The attempt at a solution I thought that using PV = nRT --> Pm/density = nRT would be sufficient in solving this problem, but when I tried to solve this I found that I needed the mass of the molecule and there was no number of moles expressed for me to solve n, etc. So now I am stuck and not even sure if that is the proper equation to use. This problem seems simple enough, but I have myself all mixed up about it!