how to find how many moles of gas?
To find the mole count, divide the mass in grams by 2.016. For example, if the mass of the hydrogen gas is 0.5 grams, then n equals 0.2480 moles. Convert the temperature T into Kelvin units by adding 273.15 to the temperature in Celsius. Use the ideal gas equation (PV=nRT) to solve for pressure.