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What is a mole and its units? ( 2 marks)
The mole is the amount of substance in grams that has the same number of particles as there are atoms in 12 grams of carbon-12.
What is one mole? ( 2 marks)
6.02 X 10
What are the formula to find moles? (4 marks)
moles= mass (g) ÷ molar mass (g mol
moles= concentration/molarity(mol dm
moles= number of particles/atoms present/ no. in 1 mole
) ÷ 24
What is the molar mass?
The average mass of a molecule on a scale where an atom of carbon 12 is 12
What the rule between moles and gases?
One mole of any gas occupies 24 dm
at 298 K and 1 atm
What is the empirical formula?
The smallest whole number ratio of atoms in a compound
What is the molecular formula?
The actual number of atoms in a molecule
Equation for part per million?
Concentration = (mass of component ÷ mass of solution) × 1 000 000 ppm
Equation for percentage yield?
Percentage yield = (Actual yield ÷ theoretical yield) × 100
Equation for atom economy?
Atom economy= (molecular mass of desired product ÷ sum of molcular massess of all the products) × 100
AS Chemistry Unit 1