1. Tardigrade
  2. Question
  3. Chemistry
  4. The Δ Hf° for CO 2(g), CO (g) and H 2 O (g) are -393.5,-110.5 and -241.8 kJ mol -1 respectively. The standard enthalpy change (in kJ mol -1 ) for the reaction CO 2(g)+ H 2(g) longrightarrow CO (g)+ H 2 O (g) is

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Q. The $\Delta H_{f}^{\circ}$ for $CO _{2}(g), CO (g)$ and $H _{2} O (g)$ are $-393.5,-110.5$ and $-241.8\, kJ\, mol ^{-1}$ respectively. The standard enthalpy change (in $kJ \, mol ^{-1}$ ) for the reaction $CO _{2}(g)+ H _{2}(g) \longrightarrow CO (g)+ H _{2} O (g)$ is

IIT JEEIIT JEE 2000Thermodynamics

Solution:

$CO _{2}(g)+ H _{2}(g) \longrightarrow CO (g)+ H _{2} O (g)$
$\Delta H=\Sigma \Delta_{f} H^{\circ}$ (products) $-\Sigma \Delta_{f} H^{\circ}$ (reactants)
$=-110.5-241.8-(-393.5)=+41.20\, kJ$