Question detail

What is the number of moles in 18 grams 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

1 mol

The relative formula mass of water (H2O) is 18 g/mol. Therefore, 18 g of water corresponds to 1 mole.

Confusing Mass and Moles

Students often confuse mass (in grams) with the number of moles when calculating the amount of substance.

Always remember to use the formula: moles = mass / relative formula mass, ensuring you convert mass to the correct unit before calculation.

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