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How much propane would have to be combusted to preheat a 5.0kg cast iron barbeque to a temperature of 175C (from 25C) if the barbeque

How much propane would have to be combusted to preheat a 5.0kg cast iron barbeque to a temperature of 175C (from 25C) if the barbeque is 50% efficient and cast iron has a specific heat capacity of 0.46 J/(gC)?

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