Use standard enthalpies of formation to calculate delta H)nm degree for the foll

Question

Use standard enthalpies of formation to calculate delta H)nm degree for the following reaction 2H_2S(g) + 3O_2(g) rightarrwaao 2H_2O(I) + 2SO_2(g) Express your answer using four significant figures. Use standard enthalpies of formation to calculate delta H_nm degree for the following reaction: CH_4(g) + 2O_2(g) rightarrow CO_2(g) + 2H_2O(g) Express your answer using three significant figures. Use standard enthalpies of formation to calculate delta H_rm degree for the following reaction: C(s) + O_2(g) rightarrow CO_2(g) Express your answer using four significant figures.

Explanation / Answer

A)

DHRxn = Hproducts - Hreactants

HRxn (2H2O + 2SO2) - (2H2S + 3O2)

HRxn (2*285.830+ 2*296.81) - (2*20.6+ 3*0)

HRxn = -1124.08 kJ

B)

HRxn = CO2 + 2H2O - (CH4 + 2O2)

HRxn = -393.5 + 2*241.826 - (74.8+ 2*0)

HRxn = -15.352kJ

C)

HRxn for CO2 = CO2 - (C + O2) = -393.5 kJ - 0 + 0 = -393.5 kJ

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