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Phil
Phil asked in Science & MathematicsChemistry · 9 years ago

Enthalpy Change help!?

Calculate the change in enthalpy (kJ) for the following reaction:

CH4(g) + O2(g) ---> CO2(g) + 2H20(L)

I know that dH = mass * change in temp * C

But the equation doesn't give the change in temperature or specify the masses.

If you could explain what you did that would also help, thanks :)

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  • ChemTeam
    Lv 7
    9 years ago
    Favorite Answer

    CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(L)

    This question might be asking you to do this via a Hess' Law calculation using standard enthalpies of formation. Here are some examples of this:

    http://www.chemteam.info/Thermochem/HessLawIntro2....

    Remember, the standard enthalpy of formation for O2 is zero.

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