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Stoichiometry

"The reaction...

Question

"The reaction of sodium metal with water is highly endothermic."
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Solution

The reaction of sodium metal with water is highly exothermic.
This is because enough heat is given off during the exothermic reaction to ignite the produced $H_{2} (g)$ .
Sodium reacts strongly with water according to the following reaction mechanism:
$2 N a (s) + 2 H_{2} O ⟶ 2 N a O H (a q) + H_{2} (g)$
This is an exothermic reaction. Sodium metal is heated and may ignite and burn with a characteristic orange flame. Hydrogen gas released during the burning process reacts strongly with oxygen in the air.

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