Chemistry Practice Problems Hess's Law Practice Problems Solution: Use the standard reaction enthalpies given below t...

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# Solution: Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: P4(g) + 10Cl2(g) → 4PCl5(s)                ΔH°rxn = ? Given PCl5(s) → PCl3(g) + Cl2(g)                   ΔH°rxn = +157kJ P4(g) + 6Cl2(g) → 4PCl3(g)                  ΔH°rxn = -1207kJ A) -1835 kJ B) - 1364 kJ C) -1050 kJ D) -1786kJ E) -2100 kJ

###### Problem

Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:

P4(g) + 10Cl2(g) → 4PCl5(s)                ΔH°rxn = ?

Given

PCl5(s) → PCl3(g) + Cl2(g)                   ΔH°rxn = +157kJ
P4(g) + 6Cl2(g) → 4PCl3(g)                  ΔH°rxn = -1207kJ

A) -1835 kJ

B) - 1364 kJ

C) -1050 kJ

D) -1786kJ

E) -2100 kJ

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