Chemistry Topic Practice
Moles and Mass Calculations | GCSE Chemistry Practice
A mole is a unit that represents 6.02 x 10^23 particles.
How much does one mole of Carbon weigh?
What is Moles and Mass Calculations | Practice?
"The base unit of amount of substance in the International System of Units (SI)."
Question 1
Which formula is used to calculate the number of moles?
Question 2
Calculate the mass of 0.25 moles of Calcium Carbonate (CaCO3). (Mr=100)
Question 3
How many moles are in 36g of water? (Mr of H2O = 18)
The Mole Formula
Moles = Mass (g) / Mr (relative formula mass).
Mass = Moles x Mr.
Avogadro constant is 6.02 x 10^23.
Exam Tip
Math Tip: Rearrange the formula using a triangle—Mass at the top, Moles and Mr at the bottom.
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