Question

hydrocarbon mixture 60% c3h8, 40% CxHy 10 g of mixture was burned with O2 excess to give 29.02 g co2 and 8.8 g h2o. what is CxHy?

Answer 1

Something is wrong with your problem. Either you have copied it wrong or the person making up the problem goofed. A 10 g mixture that is 60% C3H8 will produce 9.8 g H2O alone which leaves no water for the CxHy to produce.

Answer 2

I think the combustion results in 18.8 g H2O... still don't know how to get CxHy though.