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Question

Carbon dioxide is produced from carbon and oxygen by the exothermic reaction represented below: 
$$C(s)+O_2(g)\rightarrow CO_2(g)+394\ kJ$$
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-
$$C$$ $$+$$ $$O_2$$ $$=$$ $$CO_2$$ $$+$$ $$heat$$
Formation of Carbon dioxide from Carbon and Oxygen is an exothermic reaction. Almost $$394kJ$$ of heat is produced or given off.
From the equation it is seen that since it is an exothermic reaction-
$$1$$ mole of $$CO_2$$ releases $$394kJ$$ of heat
Thus, $$2$$ mole of $$CO_2$$ releases ($$394$$$$\times$$$$2$$) that is $$788kJ$$ of heat.
Option E is the correct answer.

Chemistry

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