# When magnesium (mg) metal is placed in hydrochloric acid (hcl), it forms magnesium chloride

When magnesium (mg) metal is placed in hydrochloric acid (hcl), it forms magnesium chloride (mgcl2) and a gas. what gas is formed in this reaction?

## This Post Has 4 Comments

1. Expert says:

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

$\delta h=e_p-e_r$

$\delta h$= enthaply

$e_p$ = energy of products

$e_r$ = energy of reactants

as $e_p< e_r$, thus $\delta h$ comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

2. josselynparra22 says:

Hydrogen gas is formed.

acid + metal = salt + hydrogen

3. lightskinbaby2 says:

Magnesium in hydrochloric acid forms H2 (hydrogen) gas according to the balanced chemical equation:
Mg + 2HCl→H2 + MgCl2

4. Expert says:

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explanation: