Question

If 8.60 grams of methane gas (hint: remember the fuel for the bunsen burner) is in a 2.00 L container at 66oC, what is the pressure in the container?

Answer 1

Data:

Gas: methane = CH4

V = 2.00 liter

T = 66°C = 66 + 273.15 K = 339.15 K


Use the ideal gas equation pV = n RT


R = 0.082 atm*liter / K*mol


n is the number of moles and is calculated using the molar mass,MM, of CH4.


MM of CH4 = 12.0 g/mol + 4*1 g/mol = 16.0 g / mol


n = mass / MM = 8.60 g / 16.0 g/mol = 0.5375 mol


Now you can use the formula: pV = nRT => p = nRT / V


p = 0.5375 mol * 0.082 atm*liter / K*mol * 339.15 K / 2.00 liter


p = 7.47 atm