Question detail
Calculate the relative molecular mass (Mr) of carbon dioxide (CO2). Use the relative atomic masses: C = 12 and O = 16 (A-level cue 5b7fc68a focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Amount of substance
Question
Calculate the relative molecular mass (Mr) of carbon dioxide (CO2). Use the relative atomic masses: C = 12 and O = 16 (A-level cue 5b7fc68a focus)
Answer
The relative molecular mass of carbon dioxide (CO2) is 44 g/mol. This answer is anchored to Relative atomic mass and relative molecular mass. This version is uniquely anchored to Relative atomic mass and relative molecular mass. Retrieval anchor: A-level cue 5b7fc68a.
Explanation
The relative molecular mass of carbon dioxide (CO2) is 44 g/mol. This answer is anchored to Relative atomic mass and relative molecular mass. is correct because it supports the objective: Define relative molecular mass in relation to carbon-12.. The reasoning stays within Relative atomic mass and relative molecular mass and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Relative atomic mass and relative molecular mass. Retrieval anchor: A-level cue 5b7fc68a. This item is treated as conceptual revision rather than a formal calculation item because the validated answer is an explanation or option choice, not a worked numerical response.
Common mistake
Confusing Relative Molecular Mass with Atomic Mass
Students often confuse relative molecular mass (Mr) with relative atomic mass (Ar), leading to incorrect calculations when determining the mass of a compound.
To fix this, remember that relative molecular mass (Mr) is the sum of the relative atomic masses of all atoms in a molecule. For example, for water (H2O), calculate Mr as follows: Mr = (2 × Ar of H) + (1 × Ar of O) = (2 × 1) + (16) = 18. Therefore, the relative molecular mass of water is 18 g/mol.
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