NEEDS TO BE SOLVED USING STIOCHIOMETRY
When a 10.0g sample of a mixture of CH4 and C2H6 is burned in excess oxygen, exactly 525KJ of heat is produced. What is the percentage by mass of CH4 in the original mixture.
Heat of combustion of CH4 = -890.4KJ/mol
Heat combustion of C2H6 = -1560.0KJ/mol
Hi this is my first post so I hope i did everything correctly I would appreciate it if anyone can help me do this problem.
I got the equations:
CH4 + 2O2 --> CO2 + 2H20
2C2H6 + 7O2 --> 4CO2 + 6H2O
then i think we combine them to get:
CH4 + 2C2H6 + 9O2 --> 5CO2 + 8H2O
but after this i dont get want to do...any help would be appreciated. I know this goes against the rules but I got this problem today and my teacher wants it tomorrow, so I would appreciate it if anyone can help me do it today.
thanxs for your help