Question

Heat liberated by burning $2g$ of Carbon in excuses of oxygen is $xKJ$. The value of $\Delta Hc$ of Carbon is

• A. x KJ
• B. 6x KJ/Mol
• C. -x KJ/Mol
• D. -6x KJ/Mol

Answer 1

The correct option is D

-6x KJ/Mol

$2g$ of $C$ produces = $xKJ$ ; for $12g$ of $C$ produce heat = $\frac{x}{2}\times 12=6xKJ$. Hence, $\Delta Hc$ of $C=-6xKJ/Mol$