posted by Crystal .
A mixture of C3H8 and C2H2 has a mass of 2.0g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water.
Find the mass of C2H2 in the original mixture.
Crystal, I've spent a good deal of time on this problem. I may have missed something but I think something is missing.