Assume that an extremely inefficient electrical utility company delivers electrical energy to your home from a natural gas-burning power plant with an overall efficiency of only 31 percent and your furnace is 85 percent efficient in converting electrical energy into heat energy. what mass of natural gas the power plant must burn if heating your home requires 3.5 × 107 kj? (the heat of combustion of natural gas is 50.1 kj/g.)
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