(ΔH - ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8 ⋅ 314 JK-1 mol-1)

Question

(ΔH - ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8 ⋅ 314 JK-1 mol-1) (A) - 1238.78 J mol-1 (B) 1238.78 J mol-1 (C) - 2477.57 J mol-1 (D) 2477.57 J mol-1

Tardigrade Admin · Accepted Answer

Δ H - Δ U = Δ ng RT = + (1/2)×8.314 × 298 = + 1238.78 J mol-1 [C(S)+(1/2)O 2(g)→ CO (g) Δ ng = 1-(1/2) = (1/2)]

Q. ( $Δ$ H - $Δ$ U) for the formation of carbon monoxide (CO) from its elements at 298 K is
$(R = 8 \cdot 314 J K^{- 1} m o l - 1)$

$- 1238.78 J m o l^{- 1}$

$1238.78 J m o l^{- 1}$

$- 2477.57 J m o l^{- 1}$

$2477.57 J m o l^{- 1}$

$Δ H - Δ U = Δ n_{g} RT$
$= + \frac{1}{2} \times 8.314 \times 298$
$= + 1238.78 J m o l^{- 1}$
$⎣ ⎡ C (S) + \frac{1}{2} O 2 (g) \to CO (g) Δ n_{g} = 1 - \frac{1}{2} = \frac{1}{2} ⎦ ⎤$

Q. (ΔH - ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is (R=8⋅314JK−1mol−1)

−1238.78Jmol−1

1238.78Jmol−1

−2477.57Jmol−1

2477.57Jmol−1