We’re being asked to determine the value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur dioxide:

S(s, rhombic) + O_{2}(g) → SO_{2}(g)

We can use the following equation to solve for ** ΔG˚_{rxn}**:

$\overline{){\mathbf{\Delta G}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\Delta G}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{prod}}{\mathbf{-}}{\mathbf{\Delta G}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{react}}}$

Use the table below to answer the questions that follow.

The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur dioxide,

S(s, rhombic) + O_{2}(g) --> SO_{2}(g)

is __________ kJ/mol.

a. -300.4 kJ/mol

b. -269.9 kJ/mol

c. +300.4 kJ/mol

d. +269.9 kJ/mol

e. -370.4 kJ/mol

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

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