hibachi395 hibachi395 Today at 7:42 PM Chemistry Answered The heats of combustion of CxHy, carbon and hydrogen are a, b and c cal respectively. The heat of formation of CxHy, will be:A. −(xb+yc/2−a/2) calB. −(xb+yc/2−a) calC. (xb−yc/2+a/2) calD. (xb−yc/2−a/2) cal