For Moles (HT only), which option best supports this Unit 4.3 objective: (HT only) Use an appropriate number of significant figures in amount-of-substance calculations. (MS 2a)?

The answer is 0.25 mol.

The correct option is 0.25 mol. This uses Moles From Mass because the objective is about (HT only) Use an appropriate number of significant figures in amount-of-substance calculations. (MS 2a). The reasoning belongs to Moles (HT only) within Use of amount of substance in relation to masses of pure substances, 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 HT only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3. The other options are weaker because they either use the wrong formula, the wrong unit, a vague relationship, or the wrong quantitative context.