Calculate the heat needed at constant pressure to bring one mole of methane a. f

Question

Calculate the heat needed at constant pressure to bring one mole of methane
a. from 25 oC to 500 oC
b. from 25 oC to 200 oC
c. from 200 oC to 500 oC

Explanation / Answer

PV = nRT CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l) The above chemical equation shows that 2 moles (64 g) of oxygen molecules are required to burn 1 mole of methane. Again, it is impossible to know the total enthalpy (heat energy content) of the oxygen. Likewise, we can't know the total heat energy content of 1 mole of CO2 and 2 moles of H2O (the products). Delta H = (HCO2 + 2HH2O) - (HCH4 + 2HO2)

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