Question detail

What is the mass of 2 moles of water (H2O)?

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 relative formula mass of water (H2O) is 18 g/mol. Therefore, 2 moles of water have a mass of 2 x 18 g = 36 g.

Confusing Mass and Moles

Students often confuse the mass of a substance with the number of moles when calculating masses from a balanced symbol equation.

To fix this, remember to use the relative formula mass to convert between mass and moles correctly, ensuring you apply the correct formula.

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