Problem: Given the following thermochemical data:                                                                                ∆H°f (kJ)I. P4(s) + 6 Cl2(g) ⟶ 4 PCl3(g)                        –1225.6II. P4(s) + 5 O2(g) ⟶ P4O10(s)                         –2967.3III. PCl3(g) + Cl2(g) ⟶ PCl5(g)                         –84.2IV. PCl3(g) + 1/2 O2(g) ⟶ POCl3(g)                –285.7Calculate the value of ∆H° for the following reaction:P4O10(s) + 6 PCl5(g) ⟶ 10 POCl3(g)A. –110.5 kJ B. –610.1 kJ C. –2682.2 kJ D. –4562.8 kJE. –7555.0 kJ

FREE Expert Solution

We’re being asked to determine the enthalpy change (ΔHrxn) for the chemical reaction:

P4O10(s) + 6 PCl5(g) ⟶ 10 POCl3(g)

We can use Hess’s Law to determine the enthalpy change of the overall reaction from the given reactions:

90% (368 ratings)
View Complete Written Solution
Problem Details

Given the following thermochemical data:

                                                                                ∆H°f (kJ)

I. P4(s) + 6 Cl2(g) ⟶ 4 PCl3(g)                        –1225.6

II. P4(s) + 5 O2(g) ⟶ P4O10(s)                         –2967.3

III. PCl3(g) + Cl2(g) ⟶ PCl5(g)                         –84.2

IV. PCl3(g) + 1/2 O2(g) ⟶ POCl3(g)                –285.7

Calculate the value of ∆H° for the following reaction:

P4O10(s) + 6 PCl5(g) ⟶ 10 POCl3(g)

A. –110.5 kJ 

B. –610.1 kJ 

C. –2682.2 kJ 

D. –4562.8 kJ

E. –7555.0 kJ

Frequently Asked Questions

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.

What is the difficulty of this problem?

Our tutors rated the difficulty ofGiven the following thermochemical data:           medium difficulty.

What professor is this problem relevant for?

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