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
B
394 kilojoules are absorbed
C
788 kilojoules are released
D
197 kilojoules are released

Solution

## The correct option is C $$788$$ kilojoules are releasedThe 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 heatThus, $$2$$ mole of $$CO_2$$ releases ($$394$$$$\times$$$$2$$) that is $$788kJ$$ of heat.Option E is the correct answer.Chemistry

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