Problem- Ethylene (C2H4) is the starting material for the preparation of polyethylene. Although typically made during the processing of petroleum, ethylene occurs naturally as a fruit-ripening hormone and as a component of natural gas. The heat of reaction for the combustion of C2H4 is -1411 kJ/mol. How many grams of C2H4 must burn to give 91.8 kJ of heat?
Express your answer using two significant figures.