O-LevelMathematicsNumber4024/11 · May/June 2014 · Q381 Mark

One molecule of water is made up of two atoms of hydrogen and one atom of oxygen. The mass of one atom of hydrogen is 1.67 × 10⁻²⁴ g. The mass of one atom of oxygen is 2.66 × 10⁻²³ g. Calculate the mass of one molecule of water. Give your answer in standard form.

Mark scheme

Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.

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Topic: Number, O-Level Mathematics (syllabus 4024). Structured question, 1 mark.
Source: O-Level Mathematics, May/June 2014 Paper 1 Variant 1, question 38.

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