(HT only) Use ratios, fractions and percentages in reacting-mass calculations. (MS 1c)

In the subtopic Amounts of substances in equations (HT only), this learning objective focuses on (HT only) Use ratios, fractions and percentages in reacting-mass calculations. (MS 1c). It sits within Use of amount of substance in relation to masses of pure substances for AQA GCSE Chemistry 8462 Unit 4.3, so the explanation must stay anchored to quantitative chemistry rather than drifting into a general chemistry idea. Approved keywords to use include HT only, ratio, MS 1c. Ratios. means a relationship between two quantities, indicating how many times one value contains or is contained within the other, often used in calculations involving moles Avoid the mistake of students often confuse the ratios of reactants and products in a balanced equation, applying mass ratios instead of mole ratios; instead, always refer to the coefficients in the balanced equation to determine mole ratios, and remember that these ratios are not the same as mass ratios For exam answers, always convert your masses into moles before applying ratios in reacting-mass calculations