You are provided the following data: H2(g) → 2 H(g) Br(g) → 2 Br(g) H2(g) +...

Question

Question

science chemistry

Answer 1

Answer #1

Lets number the reaction as 1, 2, 3, 4 from top to bottom

required reaction should be written in terms of other reaction

This is Hess Law

required reaction can be written as:

reaction 4 = -0.5 * (reaction 1) -0.5 * (reaction 2) +0.5 * (reaction 3)

So, ΔHo rxn for required reaction will be:

ΔHo rxn = -0.5 * ΔHo rxn(reaction 1) -0.5 * ΔHo rxn(reaction 2) +0.5 * ΔHo rxn(reaction 3)

= -0.5 * (436.4) -0.5 * (192.5) +0.5 * (-72.4)

= -350.65 KJ

Answer: -350.65 KJ

Answer 2

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