Calculate the relative formula mass of aluminium sulfate, Al2(SO4)3 (2 marks)
As the question is 2 marks, show working to ensure you get a mark even if answer is slightly wrongFrom periodic table you can see that the relative atomic masses are oxygen = 16; aluminium = 27; sulfur = 32(2 × 27) + 3[32 + (16 × 4)] = 342Take care with brackets and order
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