Quantitative Chemistry

Quantitative Chemistry from Edexcel GCSE C2 Exam

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• Quantitative Chemistry
• The relative formula mass is the sum of all relative atomic masses of atoms in formula
• The emperical formula shows the ratio of each atom in the formula
• percentage composition is the percentage of an element in a formula by mass
• Balanced equations are used to calculate reacting masses
• A yield is the amount of product made in a reaction
• The theoretical yield is the calculated yield
• The percentage yield is the actual yield divided by the calculated yield
• Industrial chemists consider yields, waste and reaction rates when making products
• Actual yield is nearly always less than the theoretical yield because not all reactants react, the reaction may be reversiable and other reactions may occur