The balanced equation for the combustion of C2H2 is shown below 2C2H2+5O2 ->4CO2+2H2O      ΔH=-395.5 kJ/molrxn How many grams of O2 (MM = 32 g/mol ) (MM=32 g/mol) would need to be reacted in an excess of C2H2 in order to produce 1.2×103 kJ of energy? Answer choices:  A. 98 g B. 4.9 x 102 g C. 7.6 x 107g D. 15 g

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