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    Working with enthalpy change

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    Consider the following reaction.
    CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H = -891 kJ
    Calculate the enthalpy change for each of the following cases.
    (a) 3.00 g methane is burned in excess oxygen.
    (b) 3.00 103 L methane gas at 738 torr and 21°C is burned in excess

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