Questions
CHM1051 MUM S2 2025 CHM1051 Practice Exam 2
Single choice
Given the data: N2(g), Δf Ho = 0.00 kJ·mol–1, So = +191.5 J·mol–1·K–1H2(g), Δf Ho = 0.00 kJ·mol–1, So = +130.6 J·mol–1·K–1NH3(g), Δf Ho = -46.0 kJ·mol–1, So = +192.5 J·mol–1·K–1 calculate the standard free energy change, ΔGo, for the reaction: N2(g) + 3 H2(g) → 2 NH3(g)
Options
A.a. –82.0 kJ·mol–1
B.b. –32.9 kJ·mol–1
C.c. –7.4 kJ·mol–1
D.d. +13.1 kJ·mol–1
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Step-by-Step Analysis
To tackle this thermodynamics problem, I’ll break down the data and compute the standard free energy of formation for each species at 298 K, then apply them to the reaction.
First, note the given data: N2(g) with ΔfH° = 0.00 kJ·mol–1 and S° = 191.5 J·mol–1·K–1; H2(g) with ΔfH° = 0.00 kJ·mol–1 and S° =......Login to view full explanationLog in for full answers
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