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What is the formula to calculate the number of moles?
moles = mass ÷ RFM
What is the unit for amount of substance?
mol.
What is the RFM of oxygen?
32
Calculate the number of moles in 10 g of calcium carbonate.
0.1 mol
How many particles are in one mole of a substance?
6.02 × 10²³
What is this number called? (6.02 × 10²³)
Avogadro constant
What is the unit of concentration?
g/dm³ or mol/dm³
What is the formula to calculate concentration?
concentration = mass ÷ volume OR concentration = moles ÷ volume
Calculate the concentration if 5 g of solute is dissolved in 2 dm³ of solution.
2.5 g/dm³
What volume does one mole of gas occupy at room temperature and pressure (RTP)?
24 dm³
Calculate the volume of 2 moles of gas at RTP.
48 dm³
What is the formula for calculating gas volume at RTP?
volume = moles × 24
What is meant by a limiting reactant?
The reactant that runs out first
What is the formula for percentage yield?
(actual yield ÷ theoretical yield) × 100
Calculate the percentage yield if the theoretical yield is 20 g and the actual yield is 15 g.
75%
Why is percentage yield often less than 100%?
SPECIFIC product is lost during the reaction
