Question detail
Calculate the relative formula mass (Mr) of water (H2O).
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Question
Calculate the relative formula mass (Mr) of water (H2O).
Answer
The answer is 2.
Explanation
This uses Relative Formula Mass because the objective is about define relative formula mass, Mr, as the sum of the relative atomic masses of atoms in the numbers shown in a formula. The reasoning belongs to Relative formula mass within Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term relative atomic mass to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3.
Common mistake
Confusing Relative Atomic Mass with Relative Formula Mass
Students often confuse relative atomic mass (Ar) with relative formula mass (Mr), thinking they are the same.
Remember that relative atomic mass refers to a single atom, while relative formula mass is the sum of the relative atomic masses of all atoms in a formula.
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