Homework Help: chemistry

Posted by Anonymous on Wednesday, October 24, 2012 at 12:42am.

A scientist measures the standard enthalpy change for the following reaction to be -2923.0 kJ :

2C2H6(g) + 7 O2(g) 4CO2(g) + 6 H2O(g)

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO2(g) is _________

chemistry - DrBob222, Wednesday, October 24, 2012 at 1:00am
dHrxn = (n*dHf products( - (n*dHf reactants)
2923.0 kJ = (4*dHCO2 + 6*dHH2O) - (2*dHC2H6). Look up dH H2O and dH C2H6, substitute and solve for dH CO2.

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