Question

Could someone please tell show me steps to solve this, I am so confused.

9.80 grams of magnesium metal react with excess hydrochloric acid, and 29.8 grams of magnesium chloride are produced
by the reaction. What is the percent yield of this reaction?
Mg + HCI –> MgCl2 + H2

Answer 1

And this is y I should of paid attention in that one science class in middle school that taught this...

(￣▽￣;)