Chapter 3 0.0 / 5 ? ChemistryAmount of SubstanceA2/A-levelOCR Created by: SydneyxxCreated on: 24-01-19 13:08 What is Avogadro's constant? 6.02 x 10^23 1 of 21 Moles Equation Mass / Molar Mass 2 of 21 What is the Molecular Formula? Number of atoms of each element in a molecule. 3 of 21 What is the Empirical Formula? Simplest whole number ratio of atoms of each element in a compound. 4 of 21 Definition of Relative of Molecular Mass Mr, compares the mas of a molecule with the mass of an atom of Carbon-12. 5 of 21 Definition of Relative Formula Mass Compares the mass of a formula unit with the mass of an atom of Carbon-12. 6 of 21 What is the water in Hydrated Salts called? Water of Crystallization 7 of 21 Assumptions we make in experiments? All water has been lost - heat to a constant mass. No further decomposition - colour change. 8 of 21 Empirical Formula Calculation? Mass to Moles. Divide by smallest number. Ratio found. 9 of 21 Molecular Formula Calculation? Mass to Moles. Find empirical. Work out relative mass of empirical. Find mass of of one unit molecule. Divide empirical by 1:1 ratio. Write Molecular. 10 of 21 Advanced Moles Equation Concentration x Volume / 1000 11 of 21 What is a standard solution? A solution of known concentration. 12 of 21 How is a standard solution prepared? Dissolve exact mass of solute in a solvent. Make up solution to an exact volume. 13 of 21 Finding mass of solute used in standard solution? Work out moles required. Work out molar mass. Rearrange equation to find mass. 14 of 21 Definition of Molar Gas Volume Vm, is the volume per mole of gas molecules at stated temperature and pressure. 15 of 21 Moles Gas Equation? Volume / Molar Gas Volume 16 of 21 Ideal Gas Equation? pV = nRT 17 of 21 Units for pV =nRT p = PA V = m^3 n = mol R = 8.314Jmol^-1K^-1 T = K (-273 to get c) 18 of 21 Percentage Yield Actual Yield / Theoretical Yield x100% 19 of 21 What is the limiting reagent? The reactant that is not in excess will be completely used up first and stop the reaction. 20 of 21 Atom Economy Sum of molar masses of all desired products / Sum of molar masses of all products x100% 21 of 21
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