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1).From the standard enthalpies of formation, calculate ΔH°rxn for the reaction C6H12(l) + 9O2(g) → 6CO2(g)...

1).From the standard enthalpies of formation, calculate ΔH°rxn for the reaction

C6H12(l) + 9O2(g) → 6CO2(g) + 6H2O(l)

For C6H12(l), ΔH°f = –151.9 kJ/mol (5 points)

Substance

∆H°f , kJ/mol

C6H12(l)

–151.9

O2(g)

0

H2O(l)

–285.8

CO2(g)

–393.5

2).Determine the amount of heat (in kJ) given off when 1.26 × 104 g of ammonia are produced according to the equation

N2(g) + 3H2(g) → 2NH3(g)       ΔH°= –92.6 kJ/mol

Assume that the reaction takes place under standard conditions at 25oC.

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