For the reaction, C2H2(g) → 2 C(g) + 2 H(g), one would expect ΔH° to be negative and ΔS° to be positive. ΔH° to be positive and ΔS° to be positive. ΔH° to be positive and ΔS° to be negative. ΔH° to be negative and ΔS° to be negative.
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For the reaction, 2 NH3(g) → N2(g) + 3 H2(g), one would expect ΔH° to be negative and ΔS° to be positive. ΔH° to be negative and ΔS° to be negative. ΔH° to be positive and ΔS° to be negative. ΔH° to be positive and ΔS° to be positive.
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Ethane, $\mathrm{C}_{2} \mathrm{H}_{6}$ , can be prepared by the reaction of acetylene, $\mathrm{C}_{2} \mathrm{H}_{2}$ with hydrogen. Is $\Delta S^{\circ}$ for the reaction likely to be positive or negative? Explain. $$ \mathrm{C}_{2} \mathrm{H}_{2}(g)+2 \mathrm{H}_{2}(g) \longrightarrow \mathrm{C}_{2} \mathrm{H}_{6}(g) $$
For the reaction: H2(g) + C2H4(g) -> C2H6(g) ΔG° = -103.6 kJ and ΔS° = -120.7 J/K at 277 K and 1 atm. This reaction is (reactant, product) favored under standard conditions at 277 K. The standard enthalpy change for the reaction of 2.36 moles of H2(g) at this temperature would be kJ.
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