Question #d54a2
1 Answer
Explanation:
The balanced chemical equation basically tells you how many moles of each chemical species involved in the reaction will be consumed or produced relative to each other.
In this case, you have
#"Mg"_ ((s)) + 2"HCl"_ ((aq)) -> "MgCl"_ (2(aq)) + "H"_ (2(g)) uarr#
The
Moreover, the balanced chemical equation tells you that for every mole of hydrochloric acid consumed by the reaction, you get
In your case,
#0.500 color(red)(cancel(color(black)("moles HCl"))) * "1 mole H"_2/(2color(red)(cancel(color(black)("moles HCl")))) = "0.250 moles H"_2#
The answer is rounded to three sig figs.