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Sulphuric Acid

Carbon dioxid...

Question

Carbon dioxide is produced from carbon and oxygen by the exothermic reaction represented below:
$C (s) + O_{2} (g) \to C O_{2} (g) + 394 k J$
When $2$ moles of carbon dioxide are produced by the reaction. Which of the following occurs?

A

197

kilojoules are absorbed

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B

394

kilojoules are absorbed

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C

788

kilojoules are released

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D

197

kilojoules are released

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Solution

The correct option is C $788$ kilojoules are released
The formation of Carbon dioxide from Carbon and Oxygen can be written as-
$C$ $+$ $O_{2}$ $=$ $C O_{2}$ $+$ $h e a t$
Formation of Carbon dioxide from Carbon and Oxygen is an exothermic reaction. Almost $394 k J$ of heat is produced or given off.
From the equation it is seen that since it is an exothermic reaction-
$1$ mole of $C O_{2}$ releases $394 k J$ of heat
Thus, $2$ mole of $C O_{2}$ releases ( $394$ $\times$ $2$ ) that is $788 k J$ of heat.
Option E is the correct answer.

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