Question

Carbon reacts with Sulphur to give carbon disulphide, which is an endothermic reaction, where $92kJ/mol$ of heat is absorbed. What will be the value of $\Delta H$, when $24$ grams of carbon reacts?

• A. $-92kJ$
• B. $+92kJ$
• C. $-184kJ$
• D. $+184kJ$

Answer 1

Answer: (D)

$+184kJ$

The reaction can be written as, $C$ $+$ $2S$ $+$ $Heat$ $\to$ $C{S}_2$.
Thus, we see that $1mol$ or $12grams$ of Carbon absorbs $92kJ$ of heat.
$1gram$ of Carbon will absorb $\frac{92}{12}$$kJ$ of heat
Hence, $24grams$ of Carbon will absorb $\frac{92}{12}$$\ast$$24$, that is $184kJ$ of heat.
Since, heat is absorbed, the reaction is endothermic in nature, and the value of $\Delta H$ will be positive, that is $+184kJ$.