equations and calculations
- Created by: Margaret Hobart
- Created on: 26-04-21 17:45
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- equations and calculations
- ideal gas equation
- pV=nRT
- R=8.31J/K/mol
- p=pressure (Pa)
- V=volume (m3)
- n=mole
- T=temperature (K)
- K=celcius +273
- calculates number of moles in a certain volume of gas
- pV=nRT
- percentage yield
- never 100%
- %yield=(actual yield/theoretical yield)x100
- reasons for actual yield being less than theoretical yield.
- incomplete reactions
- some chemicals are lost e.g. left on filter paper
- atom economy
- the measure of the efficiency of a reaction
- (mass of desired products/ total mass of reactants or products) x100
- companies try to use reactions with high atom economies because:
- better for the environment due to less waste
- more efficient use of raw materials and so more sustainable
- less expensive
- molecular and empirical formula
- empirical formula is the simplest whole number ratio of atoms
- 1. find moles in 100g of atom = abundance /Ar
- 2. divide each number of moles by the mallets number of moles
- 1. find moles in 100g of atom = abundance /Ar
- molecular formula is the actual whole number ratio of atoms
- empirical formula is the simplest whole number ratio of atoms
- ideal gas equation
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