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Furnaces in residential homes usually burn natural gas, which is mostly methane, CH4. Here is the balanced equation for the complete combustion of methane:CH4 + 2O2 → CO2 + 2H2O a. Explain why it is important to make sure your furnace is serviced and in proper working order before the winter. Be sure to include information about combustion reactions in your answer. b. What safety precautions should you take if your house has a furnace?