A rigid 7.80 L sealed vessel containing 2.700 mol of O2 (g), 0.600 mol of C2H4(g), and 2.400 mol of Ne(g) has an internal temperature of 85.0 C.

a.) Calculate the total pressure in the cylinder.

b.) Find the mole fraction of O2 in the vessel.

c.) A lab technician ignites the mixture in the vessel and the following reaction occurs:

C2H4 (g) + 3O2 (g) = 2CO2 (g) + 2H2O (g)

Find the mole fraction of each gas in the vessel after the reaction.