Consider the reaction 2 NO ( g )+ O 2( g ) longrightarrow 2 NO 2( g ) Predict whether the reaction is spontaneous at 298 K . Δ f G°( NO )=86.69 kJ / mol , Δ f G°( NO 2) =51.84 k J / mol

Question

Consider the reaction 2 NO ( g )+ O 2( g ) longrightarrow 2 NO 2( g ) Predict whether the reaction is spontaneous at 298 K . Δ f G°( NO )=86.69 kJ / mol , Δ f G°( NO 2) =51.84 k J / mol (A) Spontaneous (B) Non-spontaneous (C) Equilibrium (D) Cannot predict

Tardigrade Admin · Accepted Answer

For the reaction: 2 NO ( g )+ O 2( g ) longrightarrow 2 NO 2( g ) Δ G°=2 Δf G°(N O2)-[2 Δf G°(N O)+Δf G°(O2)] =(2 × 51.84)-(2 × 86.69+0)=103.68-173-38 =-69.7 kJ / mol ; Δ G° is negative So, the reaction is spontaneous.

Q. Consider the reaction 2NO(g)​+O2(g)​⟶2NO2(g)​ Predict whether the reaction is spontaneous at 298K.ΔfG∘(NO)=86.69kJ/mol,ΔfG∘(NO2​) =51.84kJ/mol

Spontaneous

Non-spontaneous

Equilibrium

Cannot predict

For the reaction: 2NO(g)​+O2(g)​⟶2NO2​(g) ΔG∘=2Δf​G∘(NO2​)−[2Δf​G∘(NO)+Δf​G∘(O2​)] =(2×51.84)−(2×86.69+0)=103.68−173−38 =−69.7kJ/mol;ΔG∘ is negative So, the reaction is spontaneous.

Q. Consider the reaction $2 N O_{(g)} + O_{2 (g)} ⟶ 2 N O_{2 (g)}$ Predict whether the reaction is spontaneous at $298 K .Δ f G^{\circ} (NO) = 86.69 k J / m o l, Δ f G^{\circ} (N O_{2})$ $= 51.84 k J / m o l$