C4.1 Relative masses and moles
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What does the relative atomic mass show?
➢The mean abundance of the element’s isotopes
What is the relative formula mass (Mr)?
➢ The addition of all the relative atomic masses of the elements
What is 1 mole?
The relative atomic mass or relative formula mass of any substance expressed in grams
What is Avogadro constant?
➢The mole of any substance which always contains the same number of atoms or molecules ➢ 6.02 x 10^23
What is the equation for the number of moles?
Mass/Mr or Mass/Ar
How are the masses of atoms compared?`
➢Measuring them to relative atomic mass of carbon-12
How do you calculate the relative atomic mass?
➢If given the % abundance of it 2 isotopes
What is the formula for calculating the relative atomic mass?
➢Ar of an element = ((Abundance x metal 1) + (Abundance x metal 2)) /100
What is the relative atomic mass of Copper 63 which has an abundance of 69% and copper 65 which has an abundance of 31%?
➢(69x63) + (31x65) / 100 = 63.5