84. The thermal effect of what reaction is equal to hea

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84. The thermal effect of what reaction is equal to heat of formation of methane? Calculate the heat of formation of methane, based on the following thermochemical equations:
H2 (z) + 1 / 2O2 (z) = H2O (w); DH = -285.84 kJ.
C (k) + O2 (g) = CO2 (g); DH = -393.51 kJ.
CH4 (g) + 2O2 (g) = 2H2O (g) + CO2 (g); DH = -890.31 kJ.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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