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Number of moles

n = m over M Or m= n x M

1

Relative atomic mass

Sum of (percentage abundance x relative atomic mass of each isotope) / 100

2

Relative formular mass or molar mass

Eg (1xH)+(4xC) =

3

Amount of substance in a mole

Number of particles of the substance / number of particles in one mole (6.022 x 10^23

4

Ice block contains 2.70 x10^23 of water. How many molecules does this represent

2.70x10^23 / 6.022 x10^23