CHEM1 - Chemical Equations 3.0 / 5 ChemistryCalculationsASAQA Created by: Hannah EastwoodCreated on: 08-09-12 15:18 What is the equation for calculating the moles of a substance? Number of moles = mass / molar mass (Mr) 1 of 13 What is the equation for calculating the moles in a solution? Number of moles = (concentration x volume in cm^3) / 1000 2 of 13 What is the equation for calculating the number of moles in a gas at r.t.p? Number of moles = volume in dm^3 / 24 3 of 13 What is the ideal gas equation? PV = nRT 4 of 13 State what 'P' stands for in the ideal gas equation, include the unit and conversion. Pressure. Measured in Pascals (Pa). To get from KPa to Pa, you multiply by 10^3. 5 of 13 State what 'V' stands for in the ideal gas equation, include the unit and conversion. Volume. Measured in m^3. To get from cm^3 to m^3, you multiply by 10^-3. 6 of 13 State what 'N' stands for in the ideal gas equation, include the units. The number of moles. Measured in Moles. 7 of 13 State what 'R' stands for in the ideal gas equation, include its value. The gas constant. It is always 8.31. 8 of 13 State what 'T' stands for in the ideal gas equation, include the unit and conversion. Temperature. Measured in Kelvins (K). To get from temperature to Kelvins you add 273. 9 of 13 What is the equation for calculating a volume? Volume = (Number of moles x 1000) / concentration 10 of 13 What is the equation for calculating percentage yeild? Percentage yeild = (Actual yeild / theoretical yeild) x 100 11 of 13 What is the equation for calculating the atom economy? % Atom economy = (Mass of desired products / Mass of reactants) x 100 12 of 13 What is Avogadros constant? The number of particles in a mole. It is roughly 6 x 10^23. 13 of 13

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