Problem- a sample of methane ch4 gives off 249 joules of, Ask an Expert

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Problem- A sample of methane, CH4, gives off 24.9 joules of energy when combusted in the presence of excess O2, according to the equation CH4 + 2 O2 ---> CO2 + 2 H2O delta H = -802.4 kJ What is the mass of methane that was combusted?

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