Question detail

If 10 g of magnesium (Mg) reacts with excess hydrochloric acid (HCl), what mass of magnesium chloride (MgCl2) is formed?

Try the question, check the answer, then read the explanation to understand the curriculum point.

At a glance

MCQ

Type

practice

Style

Topic

Use of amount of substance in relation to masses of pure substances

Question

20 g

The balanced equation is Mg + 2HCl → MgCl2 + H2. From 10 g of Mg (0.41 mol), 20 g of MgCl2 is produced.

Confusing Reactants and Products

Students often confuse the masses of reactants with the masses of products when calculating from a balanced equation.

Carefully identify which substances are reactants and which are products in the balanced equation before performing calculations.

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