# 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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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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.

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Based on our data, we think this problem is relevant for Professor Hu's class at UNCG.