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Hydrogen Gas Is Prepared by Electrolysis of Water According to the Reaction

Question 27

Multiple Choice

Hydrogen gas is prepared by electrolysis of water according to the reaction below. 2 H2O( Hydrogen gas is prepared by electrolysis of water according to the reaction below. 2 H<sub>2</sub>O( ) → 2 H<sub>2</sub>(g) + O<sub>2</sub>(g) Predict the signs of Δ<sub>r</sub>H and Δ<sub>r</sub>S. A) Δ<sub>r</sub>H > 0 and Δ<sub>r</sub>S > 0 B) Δ<sub>r</sub>H < 0 and Δ<sub>r</sub>S > 0 C) Δ<sub>r</sub>H > 0 and Δ<sub>r</sub>S < 0 D) Δ<sub>r</sub>H < 0 and Δ<sub>r</sub>S < 0 E) Δ<sub>r</sub>H = 0 and Δ<sub>r</sub>S < 0 ) → 2 H2(g) + O2(g)
Predict the signs of ΔrH and ΔrS.


A) ΔrH > 0 and ΔrS > 0
B) ΔrH < 0 and ΔrS > 0
C) ΔrH > 0 and ΔrS < 0
D) ΔrH < 0 and ΔrS < 0
E) ΔrH = 0 and ΔrS < 0

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