Combustion involves a hydrocarbon, in this case methane burning in oxygen to produce carbon dioxide and water.
To balance te equation you need 2 water molecules to provide balance for the 4 hydrogen in methane and then 2 oxygen (diatomic
To begin with we find the knowns and unknowns for the Ideal Gas Law, PV = nRT.
P = 1.00 atm
V = 10.5 L
n = ??
R = 0.0821
T = 200 C + 273 = 273 K
PV = nRT can be rearranged
n = 0.27 moles
Now you can use the balanced chemical equation and stoichiometry to solve for the moles of
I hope this was helpful.