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| Question | Answer |
| Defenition of mole | The amount of substance which contains as many elementary particles as there are atoms in exactly 12g of carbon-12. |
| How do you find the number of particles? | No. of particles = (6.02x10^2) x moles |
| Define molar mass | The mass of one mole of substance. |
| Define relative atomic mass | The weighted mean mass of an element compared with 1/12 of the mass of an atom of carbon-12. |
| How do you find the relative molecular mass? | Add up the individual relative atomic masses of the elements which make up the compounds. |
| How do you calculate the percentage by mass of an element in a compound? | % composition= (mass no. of M x no. of element) ------------------------------------------------------ x 100 Mr of total compound |
| How do you calculate the Ep formula from the percentage of one reactant? | If the percentage of only one element is given, then subtract this number from 100 to find the percentage of the other element. Divide the percentage by the Mr, then the smallest value by the other larger values to find the ratio. |
| Define molar gas volume. | The volume per mole of gas molecules at a stated temperature and pressure. |
| What is the ideal gas equation? | pV = nRT R is always 8.314Jmol-1K-1 Temperature is in Kelvin Pressure is in Pascals |
| What is percentage yield? | A measure of how efficiently the reactants are converted into products. |
| How is percentage yield calculated? | %Yield = actual yield of product ------------------------------------------- X100 theoretical yield of product |
| What is atom economy? | A measure of how much waste product a reaction produces. |
| How do you calculate atom economy? | % atom economy = sum of MM of desired product ------------------------------------------------- x100 sum of molar mass of all products |
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