C+O 2 → CO 2 ; ΔH = X C O + 1 2 O 2 → C O 2 ; Δ H = Y Then the heat of formation of C O is

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{C+O}_{2} \to {CO}_{2}; ΔH = X

C O + \frac{1}{2} O_{2} \to C O_{2}; Δ H = Y

Then the heat of formation of

C O

is

ChemistryThermodynamics (C)JEE Main

Options:

A $X - Y$
B $Y - 2 X$
C $X + Y$
D $2 X - Y$

Solution:

2916 Upvotes Verified Answer

The correct answer is:

X - Y

C + O_{2} \to {CO}_{2}; ΔH = X

...(i)

CO + \frac{1}{2} O_{2} \to {CO}_{2}; ΔH = Y

...(ii)
Eqs. (i) -(ii)

C + \frac{1}{2} O_{2} \to CO; ΔH = X - Y

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