What will be the heat of reaction for the following reaction? Will the reaction be exothermic or endothermic? Fe2O3(s) + 3H2(g) → 2Fe(s)+3H2O(l) ΔfH° (H2O, l) = - 285.83 kj mol-1, ΔfH° (Fe2O3,s) = -824.2 kj mol-1

Question

What will be the heat of reaction for the following reaction? Will the reaction be exothermic or endothermic? Fe2O3(s) + 3H2(g) → 2Fe(s)+3H2O(l) ΔfH° (H2O, l) = - 285.83 kj mol-1, ΔfH° (Fe2O3,s) = -824.2 kj mol-1 (A) -824.2 kj mol-1, exothermic (B) +33.3 kj mol-1, endothermic (C) -33.3 kj mol-1, exothermic (D) +824.2 kj mol-1, endothermic

Tardigrade Admin · Accepted Answer

ΔfH° (Fe(s)) = 0, Δ fH° (H2(g)) = 0 Δ fH° = 3(-285.83)-1(-824.2) = -857.5 + 824.2 = -33.3 kj mol-1 Reaction is exothermic.

$- 824.2 kj m o l^{- 1}$ , exothermic

$+ 33.3 kj m o l^{- 1}$ , endothermic

$- 33.3 kj m o l^{- 1}$ , exothermic

$+ 824.2 kj m o l^{- 1}$ , endothermic

$Δ_{f} H^{\circ} (F e_{(s)}) = 0$ , $Δ_{f} H^{\circ} (H_{2 (g)}) = 0$
$Δ_{f} H^{\circ} = 3 (- 285.83) - 1 (- 824.2)$
$= - 857.5 + 824.2 = - 33.3 kj m o l^{- 1}$
Reaction is exothermic.

Q. What will be the heat of reaction for the following reaction? Will the reaction be exothermic or endothermic? Fe2​O3(s)​+3H2(g)​→2Fe(s)​+3H2​O(l)​ Δf​H∘(H2​O,l)=−285.83kjmol−1, Δf​H∘(Fe2​O3​,s)=−824.2kjmol−1

−824.2kjmol−1, exothermic

+33.3kjmol−1, endothermic

−33.3kjmol−1, exothermic

+824.2kjmol−1, endothermic

Δf​H∘(Fe(s)​)=0, Δf​H∘(H2(g)​)=0 Δf​H∘=3(−285.83)−1(−824.2) =−857.5+824.2=−33.3kjmol−1 Reaction is exothermic.

$- 824.2 kj m o l^{- 1}$ , exothermic

$+ 33.3 kj m o l^{- 1}$ , endothermic

$- 33.3 kj m o l^{- 1}$ , exothermic

$+ 824.2 kj m o l^{- 1}$ , endothermic

$Δ_{f} H^{\circ} (F e_{(s)}) = 0$ , $Δ_{f} H^{\circ} (H_{2 (g)}) = 0$
$Δ_{f} H^{\circ} = 3 (- 285.83) - 1 (- 824.2)$
$= - 857.5 + 824.2 = - 33.3 kj m o l^{- 1}$
Reaction is exothermic.