Using the data in the table, calculate the standard entropy changes (J/mol•K) for the following reactions at 25 °C.
S(s) + O2(g) → SO2(g)
MgCO3(s) → MgO(s) + CO2(g)
2 C2H6(g) + 7O2(g) → 4 CO2(g) + 6 H2O(l)
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