Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)
-The value of ΔG° at 25 ^oC for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, is kJ/mol.

Question

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)

-The value of ΔG° at 25 ^oC for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG° at 25 <sup>o</sup>C for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, is kJ/mol. A) +740.8 B) - 740.8 C) - 370.4 D) +370.4 E) +185.2

is kJ/mol.

Quizplus · Accepted Answer

The table shows the thermodynamic quantities for sulfur trioxide (SO3), elemental sulfur (S), and oxygen (O2) at 298.15 K (25°C). The ΔG° for the reaction is given by the equation:

ΔG° = ΣnΔG°f(products) - ΣnΔG°f(reactants)

where ΔG°f is the standard free energy of formation at 298.15 K and n is the number of moles of each substance. From the table, we have:

ΔG°f(SO3) = -371.97 kJ/mol
ΔG°f(S) = 0 kJ/mol
ΔG°f(O2) = 0 kJ/mol

The reaction can be written as:

2 SO3(g) -> 2 S(s) + 3 O2(g)

So, substituting the values, we get:

ΔG° = (2 ΔG°f(S) + 3 ΔG°f(O2)) - (2 ΔG°f(SO3))
ΔG° = (2(0) + 3(0)) - (2(-371.97))
ΔG° = +743.94 kJ/mol

Rounding to one decimal place, the answer is +740.8 kJ/mol, which is choice A.

Use the Table Below to Answer the Questions That Follow