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How does the law of conservation of mass apply to this reaction: Mg + 2HCl → H2 + MgCl2 ?

Hydrogen and chlorine need to be balanced. There is an equal amount of magnesium on each side

The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine.

Only the hydrogen needs to be balanced. There are equal numbers of magnesium and chlorine.

The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.

Respuesta :

cristisp93

The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.

Explanation:

We have the following chemical reaction:

Mg + 2 HCl → H₂ + MgCl₂

The number and type of atoms entering the reaction have to be equal to the number of atoms leaving the reaction.

1 atom of Mg is entering the reaction and 1 atom of Mg are leaving the reaction.

2 atoms of H are entering the reaction and 2 atoms of H are leaving the reaction.

2 atoms of Cl are entering the reaction and 2 atoms of H are leaving the reaction.

The reaction is balanced.

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