Amounts of Substance 4.5 / 5 based on 4 ratings ? ChemistryCalculationsASAQA Created by: Sophie PerrettCreated on: 17-03-15 11:55 What is relative atomic mass? The weighted average mass of an atom of an element, realtive to a twelth of the relative atomic mass of an atom of carbon 12 1 of 18 What is the relative molecular mass? The mass of that molecule compared to a twelth of the relative atomic mass of an atom of carbon 12 2 of 18 What is avagardro's number? 6.022x10-23 3 of 18 How do we work out number of moles? mass in g/molar mass 4 of 18 What is the ideal gas equation? PV=nRT 5 of 18 In the ideal gas equation, what are the units for pressure? Pa 6 of 18 In the ideal gas equation, what are the units for volume? m3 7 of 18 In the ideal gas equation, what are the units for temperature? K 8 of 18 How do you convert C to K? Add 273 9 of 18 How do you get from cm to m? Divide by 1000 10 of 18 How do you get from KPa to Pa? Time by 1000 11 of 18 How to work out the molecular formula? Relative molecular mass/relative mass of emperical formula 12 of 18 What units is concentration measured in? mol dm-3 13 of 18 How do you work out concentration? moles/volume in dm3 14 of 18 How do you calculate % atom economy? Mass of desired/mass of reactants x 100 15 of 18 How to calculate the yield of a reaction? Number of molesof specified product/theoretical max number of moles of products x100 16 of 18 What does atom economy tell us? Tells us in theory how many atoms must be wasted in a reaction 17 of 18 What does the percentage yield tell us? Pratical effciency of a reaction 18 of 18
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