QJEEM19Chb767: JEE Main 2019 Chemistry - Class 11 JEEM19Chb767 Solution: Given (i)  C (graphite) + O 2 (g) CO 2 (g); rH = x kJ …

Question

Verified Solution • 2025–26 Session moderate

Given

(i) C (graphite) + O₂(g)

\to

CO₂(g);

\Delta

rH

^\Theta

= x kJ mol^{$-$ 1}

(ii) C(graphite) +

{1 \over 2}

O₂(g)

\to

CO(g);

\Delta

rH

^\Theta

= y kJ mol^{$-$ 1}

(iii) CO(g) +

{1 \over 2}

O₂(g)

\to

CO₂(g);

\Delta

rH

^\Theta

= z kJ mol^{$-$ 1}

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

Accepted Answer

In reaction (i), the product is CO₂

If we add reaction (ii) and (iii) we get,
C + O₂

\to

CO₂
here also product is CO₂ from same reactant C and O₂.

So according to hess law, we can say
x = y + z

QJEEM19Chb767: JEE Main 2019 Chemistry - Class 11 JEEM19Chb767 Solution: Given (i)&nbsp;&nbsp;C (graphite) + O 2 (g) CO 2 (g); rH = x kJ …