Question

In: Chemistry

Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: (8...

Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: (8 pts)


Zn(s) + 1/8S8(s) + 2O2(g)  → ZnSO4(s)

Zn(s) + 1/8S8(s)   →   ZnS(s)                                 ΔH = -183.92 kJ
2ZnS(s) + 3O2(g)   →   2ZnO(s) + 2SO2(g)             ΔH = -927.54 kJ
2SO2(g) + O2(g)   →   2SO3(g)                                 ΔH = -196.04 kJ
ZnO(s) + SO3(g)   →   ZnSO4 (s)                              ΔH = -230.32 kJ

Solutions

Expert Solution

Zn(s) + 1/8S8(s) + 2O2(g)  → ZnSO4(s)  ΔH = ??

Zn(s) + 1/8S8(s)   →   ZnS(s)                                 ΔH1 = -183.92 kJ rxn(1)

ZnS(s) + 3/2 O2(g)   →   ZnO(s) + SO2(g)             ΔH2 = -463.77 kJ rxn (2)

SO2(g) + 1/2O2(g)   →   SO3(g)                                 ΔH3 = -98.02 kJ rxn(3)

ZnO(s) + SO3(g)   →   ZnSO4 (s)                              ΔH4 = -230.32 kJ rxn (4)

add all reaction

Zn(s) + 1/8S8(s) + 2O2(g)  → ZnSO4(s)  ΔH = ΔH 1 + ΔH2 + ΔH3 + ΔH4

ΔH = ΔH 1 + ΔH2 + ΔH3 + ΔH4

ΔH = -183.92 -463.77 -98.02 -230.32

ΔH = -976.03‬ kJ

queen_honey_blossom answered 3 years ago
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