QuestionApril 18, 2026

1. Balance the following chemical equation: 2Mg(s)+1HClarrow underline (1)MgCl_(2)+2H_(2)(g)

1. Balance the following chemical equation: 2Mg(s)+1HClarrow underline (1)MgCl_(2)+2H_(2)(g)
1. Balance the following chemical equation: 2Mg(s)+1HClarrow underline (1)MgCl_(2)+2H_(2)(g)

Solution
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Answer

2Mg(s) + 4HCl(aq) \rightarrow 2MgCl_2(aq) + 2H_2(g) Explanation 1. Identify elements and counts Count atoms on each side. Left: Mg=2, H=1, Cl=1. Right: Mg=1, Cl=2, H=2. 2. Balance Mg To match Mg, place coefficient 2 before MgCl_2: 2Mg + HCl \rightarrow 2MgCl_2 + H_2. 3. Balance Cl Each MgCl_2 has 2 Cl atoms, so 2 × 2 Cl = 4 Cl total. Place 4 before HCl: 2Mg + 4HCl \rightarrow 2MgCl_2 + H_2. 4. Balance H 4 HCl gives 4 H atoms, matching 2 H_2 molecules: 2Mg + 4HCl \rightarrow 2MgCl_2 + 2H_2.

Explanation

1. Identify elements and counts <br /> Count atoms on each side. Left: $Mg=2$, $H=1$, $Cl=1$. Right: $Mg=1$, $Cl=2$, $H=2$. <br /><br />2. Balance Mg <br /> To match $Mg$, place coefficient 2 before $MgCl_2$: $2Mg + HCl \rightarrow 2MgCl_2 + H_2$. <br /><br />3. Balance Cl <br /> Each $MgCl_2$ has 2 Cl atoms, so 2 × 2 Cl = 4 Cl total. Place 4 before $HCl$: $2Mg + 4HCl \rightarrow 2MgCl_2 + H_2$. <br /><br />4. Balance H <br /> 4 $HCl$ gives 4 H atoms, matching 2 $H_2$ molecules: $2Mg + 4HCl \rightarrow 2MgCl_2 + 2H_2$.
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