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What are chemicals usually measured by?
Mass or volume
On what scale do reactions take place?
The atomic scale
What quantity do chemists use to count the number of particles in a substance? What unit is this measured in?
A quantity called amount of substance 'n' is measured in a unit called the mole 'mol'
What is the Avogadro constant ?
6.02 x 10²³ mol¹ which is the number of particles in each mole of carbon-12
How can you easily find the mass of one mole of atoms of any element?
It's the relative atomic mass on grams.
What is it important to mention when working in moles?
The formula or unambiguous name of a substance for clarity.
What does the molar mass give?
It gives the mass in grams in each mole of the substance.
What is the equation that links amount of substance n, mass m, and molar mass M?
m = n x M
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