Without doing a calculation predict whether the entropy change will be positive or negative when each reaction occurs in the direction it is written. Entropy increases and the change in entropy is positive when a reaction occurs (1) when there are more gaseous products than gaseous reactants (∆ngas > 0) and (2) when there are more aqueous products than aqueous reactants if no gases are present. (a) C3H6(g) + H2(g) → C3H8(g) (b) N2(g) + 3H2(g) → 2NH3(g) (c) CaCO3(s) → CaO(s) + CO2(g)

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