Calculations 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEAQA Created by: SunsetCreated on: 05-01-14 15:19 What are isotopes? Atoms that have the same atomic number but different mass number 1 of 11 What is the relative formula mass of water (hydrogen = 1 and oxygen = 16) 18 2 of 11 How do you find the percentage composition of one element in a compound? (Total mass of element/total mass of compound) x 100% 3 of 11 What is an empirical formula? A molecular formula in its simplest ratio 4 of 11 What would C2H6 be in an empirical formula? CH3 5 of 11 What does a reacting mass calculation tell you? The mass of a product given the mass of the reactant or vice versa 6 of 11 How is the number of moles calculated? Mass (g) / Relative atomic Mass 7 of 11 How is the mass of an element found? Moles x Relative Formula Mass 8 of 11 How is the percentage yield calculated? (Actual Yield / Theoretical Yield) x 100% 9 of 11 Why is the actual yield always lower than the theoretical yield? Some of the product is lost in filtration, evaporation, heating, transferring liquids or side/reversible reactions 10 of 11 You produce 12g of product when you expected 20g. What is your percentage yield? 60% 11 of 11
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