Given: i C graphite + O 2 g → CO 2 g ; ΔrH Θ = x kJ mol - 1 ii C graphite + 1 2 O 2 g → CO g ; ΔrH Θ = y kJ mol - 1 iii CO g + 1 2 O 2 g → CO 2 g ; ΔrH Θ = z kJ mol - 1 Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct?

C + O 2 → CO 2 , ΔH = x We get the above equation by adding ( 2 ) and ( 3 ) C + 1 2 O 2 → CO ΔH = y CO + 1 2 O 2 → CO 2 ΔH = z C + O 2 → CO 2 ΔH = x x = y + z

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Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryEnthalpy of ReactionHard2 minPYQ_2019

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Given:

$(i)$ $C (graphite) + O_{2} (g) \to {CO}_{2} (g);$ ${ΔrH}^{Θ} = x kJ {mol}^{- 1}$

$(ii)$ $C (graphite) + \frac{1}{2} O_{2} (g) \to CO (g);$ ${ΔrH}^{Θ} = y kJ {mol}^{- 1}$

$(iii) CO (g) + \frac{1}{2} O_{2} (g) \to {CO}_{2} (g);$ ${ΔrH}^{Θ} = z kJ {mol}^{- 1}$

Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct?

Options:

Answer:

Solution:

$C + O_{2} \to {CO}_{2}$ , $ΔH = x$
We get the above equation by adding $(2)$ and ( $3)$
$C + \frac{1}{2} O_{2} \to CO$ $ΔH = y$
$CO + \frac{1}{2} O_{2} \to {CO}_{2}$ $ΔH = z$
$C + O_{2} \to {CO}_{2}$ $ΔH = x$
$x = y + z$

Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Reaction

⏱ 2mℹ️ Source: PYQ_2019

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