If Cs+O_2g→CO_2g,ΔH=-X, COg+1/2O_2g→CO_2g,ΔH=-Y, Calculate Δ_fH for CO_g formation

Correct answer: (B) Y – X. C(s)+O_2(g)→CO_2g CO-g+1/2O_2-g→CO_2-g __________________________________ Cs+1/2O_2g→COg __________________________________ ∴Δ,H CO=ΔH_1-ΔH_2 =x+y or y-x

Q45 / 150 · MHT CET 2019 (Shift 2) · Chemistry

If $C (s) + O_{2} (g) \to C O_{2} (g), Δ H = - X,$

$C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g), Δ H = - Y,$

Calculate $Δ_{f} H$ for $C O_{(g)}$ formation

A
–Y –X
Correct answer
B
Y – X
C
X + Y
D
Y + X

Solution

\begin{matrix} C (s) + O_{2} (g) \to C O_{2} (g) \\ C \underset{(-)}{O} (g) + \frac{1}{2} \underset{(-)}{O_{2}} (g) \to C \underset{(-)}{O_{2}} (g) \\ __________________________________ \\ C (s) + \frac{1}{2} O_{2} (g) \to C O (g) \\ __________________________________ \end{matrix}

\begin{matrix} ∴ Δ, H C O = Δ H_{1} - Δ H_{2} \\ = x + y o r y - x \end{matrix}

Hence, the correct answer is option: 'B'.

Relevant Questions

Identify the law for the statement "Overall the enthalpy change for a reaction is equal to sum of enthalpy changes of individual steps in th20 Apr, 2026 (M)Laws of Thermochemistry and Enthalpy Change
The enthalpy of combustion of C, , and are , and kJ/mol. Find the enthalpy of formation of methane.20 Apr, 2026 (E)Laws of Thermochemistry and Enthalpy Change
Calculate the standard enthalpy change for the following reaction, Given,18 Apr, 2026 (E)Laws of Thermochemistry and Enthalpy Change
At standard enthalpy of combustion of , Cyclohexene and cyclohexane are -241, -3800 and -3920 kJ respectively. What is the heat of hydrogena17 Apr, 2026 (M)Laws of Thermochemistry and Enthalpy Change
Which of the following equations is used to obtain enthalpy change of a reaction?17 Apr, 2026 (M)Laws of Thermochemistry and Enthalpy Change
Which of the following processes is an endothermic ?17 Apr, 2026 (E)Laws of Thermochemistry and Enthalpy Change

If Cs+O2g→CO2g,ΔH=-X,COg+12O2g→CO2g,ΔH=-Y,Calculate ΔfH for COg formation

Solution

Relevant Questions

If $C (s) + O_{2} (g) \to C O_{2} (g), Δ H = - X,$

$C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g), Δ H = - Y,$

Calculate $Δ_{f} H$ for $C O_{(g)}$ formation