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: 2S(s) + 3O2(g) → 2SO3(g)     ΔH°rxn = ? Given: SO2(g) → S(s) + O2(g)       ΔH°rxn = +296.8 kJ 2SO2(g) + O2(g) → 2SO3(g)       ΔH°rxn = -197.8 kJ a. -494.6 kJ b. -692.4 kJ c. -791.4 kJ d. -98.8 kJ e. -293.0 kJ

###### Problem

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

2S(s) + 3O2(g) → 2SO3(g)     ΔH°rxn = ?

Given: SO2(g) → S(s) + O2(g)       ΔH°rxn = +296.8 kJ

2SO2(g) + O2(g) → 2SO3(g)       ΔH°rxn = -197.8 kJ

a. -494.6 kJ

b. -692.4 kJ

c. -791.4 kJ

d. -98.8 kJ

e. -293.0 kJ

###### Solution

To find the ΔHrxn, we need to use the Hess's Law where we have to rearrange the given equations to get the desired reaction

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