Question detail

What mass of water (H2O) is produced when 18 g of hydrogen (H2) reacts completely with oxygen (O2)?

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

36 g

The balanced equation for the reaction is 2H2 + O2 → 2H2O. From 18 g of H2 (1 mol), 2 mol of H2O (36 g) 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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