Chemistry - Amount of Substance (1.2) 0.0 / 5 ? ChemistryAmount of SubstanceASAQA Created by: Lauren-NewmanCreated on: 10-10-17 09:03 Mole Contains same no. particles as there are carbon atoms in 12g of carbon-12. (n) 1 of 32 Avogadro's constant 6.02 x10(23) 2 of 32 no. particles = no. moles x Avogadro's constant 3 of 32 no. moles = no. particles / Avogadro's constant 4 of 32 no. moles = mass / Mr (molar mass) 5 of 32 mass = no. moles x molar mass 6 of 32 molar mass = mass / no. moles 7 of 32 Concentration How many moles dissolved per 1dm3 of solution. 8 of 32 no. moles = conc x vol (in cm3) / 1000 or conc x vol (in dm3) 9 of 32 concentration = no. moles x 1000 / vol (in cm3) or no. moles / vol (in dm3) 10 of 32 vol (in cm3) = no. moles x 1000 / conc 11 of 32 vol (in dm3) = no. moles / conc 12 of 32 concentration (gdm-3) = molarity (moldm-3) x molar mass 13 of 32 Standard Solution Solution with known concentration (aka volumetric solution) 14 of 32 Titrations Neutralisation- work out concentration by finding out how much is needed to neutralise volumetric solution. 15 of 32 Where does the unknown concentration go? Flask 16 of 32 Where down the known concentration go? Burette 17 of 32 Titre Amount needed to neutralise. 18 of 32 Ideal Gas Equation PV= nRT 19 of 32 P Pressure, Pascals 20 of 32 V Volume, m3 (if in dm3 x10-3 or if in cm3 x10-6) 21 of 32 n Number of moles, mol 22 of 32 R Molar gas constant, 8.31Jk-1mol-1. 23 of 32 T Temperature, K (if in Celsius, add 273. 24 of 32 Ideal Gas Equation Rearranged to find Mr Mr= mRT/PV. 25 of 32 Percentage Error Error value/ volume measured x 100. 26 of 32 Empirical Formula Masses or percentages/ Mr. Divide by smallest value. 27 of 32 Molecular Formula Mr/ empirical mass x 100. 28 of 32 Percentage Yield Amount of product/ maximum amount of product x100. 29 of 32 Reasons why percentage yield is lower than expected: Reaction may be reversible, some product may be lost when separated from reaction mixture, some reactants may react in other reactions. 30 of 32 Atom Economy Percentage of total mass of reactants that can become the desired product. 31 of 32 Atom Economy Equation Mass of desired product/ total mass of products x100. 32 of 32
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