The molar mass of Na2SO4 can be calculated by adding the molar masses of its constituent atoms:
Na2SO4 = 2Na + S + 4O
Molar mass = 2(22.99 g/mol) + 32.06 g/mol + 4(15.99 g/mol) = 142.04 g/mol
The mass percentage of each element can then be calculated as follows:
Mass % of Na = (2 x 22.99 g/mol)/142.04 g/mol x 100% = 32.39%
Mass % of S = 32.06 g/mol/142.04 g/mol x 100% = 22.61%
Mass % of O = (4 x 15.99 g/mol)/142.04 g/mol x 100% = 45.00%
Therefore, sodium sulphate (Na2SO4) contains 32.39% sodium, 22.61% sulfur, and 45.00% oxygen by mass.
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