What is the theoretical yield of CC14 for a reaction using 80 g C12? If the actual yield from the reaction is 38 g of CCI4, what is the percent yield of CC14? Step 1 gram to gram Step 2 PY= (Actual/Theoretical) x 100. Molar Mass of Ch2= 70 g/mol, Molar mass of CC14= 152 g/mol C + 2C12--> CC14