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What is the formula for % mass of an element in a compound?
(Atomic mass x number of atoms in that element / Mr of the compound) x100
What is the formula to find the number of moles in a given mass?
mass in g (of an element or compound) / Mr (of an element or compound)
What is the equation to calculate the mass of a product?
Mass = Mr x moles
What is the equation to calculate the volume of a gas?
(mass of gas / Mr of gas) x24
What it the formula to calculate concentration with moles?
Number of moles / volume of solvent
What is the formula to calculate concentration with mass?
mass of solute / volume of solute
What is the conversions for concentration?
1dm3 = 1000cm3
What is the equation to calculate atom economy?
(Mr of desired products / Mr of all reactants) x100
What is the equation for percentage yield?
(mass of products actually made / theoretical yield mass of product) x100
Note 
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