AMOUNT OF SUBSTANCE 0.0 / 5 ? ChemistryCalculationsASAQA Created by: samshCreated on: 01-06-16 14:44 Definition of Relative Atomic Mass (Ar) Average mass of an atom of an element / 1/12th mass of an atom of 12C 1 of 10 Relative molecular mass (Mr) Average mass of a molecule /1/12th mass of an atom of 12C 2 of 10 how do you find out the no. of particales? Number of moles X Avogardros constant 3 of 10 how do you work out moles (with mass) Mass / Mr (Ar) 4 of 10 what does the term excess mean? If one reactant is in excess, then the other will react completely and be used up 5 of 10 What does the term limiting reagent mean? the opposite of excess, all the limiting reagent is used up in a reaction and the reaction stops. 6 of 10 How do you work out moles (with solutions) Concentration X Volume 7 of 10 What is the ideal gas equation? Pv=nRT 8 of 10 how do you work out % atom economy? (Mass of desired product / total mass of reactants) X100 9 of 10 how do you work out percentage yield? (Actual mass of product/Theoretical mas of product) X100 10 of 10
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