percentage yield and atom economy 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEOCR Created by: Lily04Created on: 10-06-17 16:15 Give the formula for percentage yield percentage yield= actual yield / predicted yield x 100 1 of 8 What does atom economy measure? measures the number of atoms that are wasted in a chemical reaction 2 of 8 Give 4 possible reasons for a reaction not obtaining 100% yield products could be lost in evaporation, filtration or during the transfer of liquids. Also, not all reactants may have been used to make the products. 3 of 8 Give the formula for atom economy Relative formula mass of desired products x 100 / sum of relative formula mass of all the products 4 of 8 Why do industry want a high percentage yield? Give 2 reasons. Reduces reactants wasted and therefore reduces the cost and maximise profits 5 of 8 Give reasons why industry want a high atom economy It reduces the amount of unwanted products and makes the process more sustainable. It conserves raw materials. 6 of 8 What needs to happen in order to get a high yield? all the reactants need to be converted into the product 7 of 8 What is the abbreviation for relative mass formula and relative atomic mass? relative formula mass = Mr, relative atomic mass= Ar 8 of 8
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