Question

aqueous magnesium chloride and hydrogen gas are produced when solid magnesium reacts with aqueous hydrochloric acid (hcl). what is the equation for this reaction? note: you do not need to balance the equation.\\(\circ\\) \\(\ce{mg(s) + hcl(aq) -> mgcl(aq) + h(g)}\\)\\(\times\\) \\(\circ\\) \\(\ce{mgcl(aq) + h(g) -> mg(s) + hcl(aq)}\\)\\(\circ\\) \\(\ce{mg(s) + hcl(aq) -> mgcl_2(aq) + h_2(g)}\\)\\(\circ\\) \\(\ce{mgcl_2(aq) + h_2(g) -> mg(s) + hcl(aq)}\\) retry

Explanation:

1. First, identify the reactants and products: Reactants are solid magnesium (Mg(s)) and aqueous hydrochloric acid (HCl(aq)). Products are aqueous magnesium chloride and hydrogen gas.
2. Magnesium (Mg) is a metal with a +2 oxidation state, and chloride (Cl⁻) has a -1 charge, so magnesium chloride should be \( \text{MgCl}_2 \) (since \( \text{Mg}^{2+} + 2\text{Cl}^-

ightarrow \text{MgCl}_2 \)). Hydrogen gas is diatomic (\( \text{H}_2 \)).

1. Check the options:

• First option: Incorrect formula for magnesium chloride (should be \( \text{MgCl}_2 \)) and hydrogen is not diatomic.
• Second option: This is a reverse reaction (products as reactants and vice versa), which is not what the question describes.
• Third option: Reactants (Mg(s) and HCl(aq)) produce products (\( \text{MgCl}_2 \)(aq) and \( \text{H}_2 \)(g)) with correct formulas.
• Fourth option: Reverse reaction, incorrect for the described reaction.

Answer:

C. \( \text{Mg}(s) + \text{HCl}(aq)
ightarrow \text{MgCl}_2(aq) + \text{H}_2(g) \) (Note: Assuming the third option is labeled as C, as per typical multiple - choice numbering where the third option is the correct one here)