PROBLEM-SOLVING CLASS ACTIVITY 11 Use Hess's Law to calculate the enthalpy of formation of CH2OH: C(graphite)...

Question

Question

science chemistry

Answer 1

Answer #1

Lets number the reaction as 0, 1, 2, 3 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 0 = -1 * (reaction 1) +1 * (reaction 2) +2 * (reaction 3)

So, ΔHo rxn for required reaction will be:

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

= -1 * (-726.4) +1 * (-393.5) +2 * (-285.8)

= -238.7 KJ

Answer: -238.7 KJ

Answer 2

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