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Molar Mass

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Question

calculate formula unit mass of aluminium sulphate

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Solution

The formula of aluminium sulphate is Al₂(SO₄)₃.

Therefore its formula mass is (27 × 2) + 3(32+16 × 4)

Hence its formula mass is 342u.

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Q. If 241.5 g of zinc sulphate

(Z n S O_{4})

reacts with 81 g of aluminium to give aluminium sulphate. Calculate the mass of the excess reagent left.

3 Z n S O_{4} + 2 A l \to A l_{2} (S O_{4})_{3} + 3 Z n

(take molar mass of

Z n

The chemical formula of aluminium sulphate is

Q. If 241.5 g of zinc sulphate

(Z n S O_{4})

reacts with 81 g of aluminium to give aluminium sulphate. Calculate the mass of the excess reagent left.

3 Z n S O_{4} + 2 A l \to A l_{2} (S O_{4})_{3} + 3 Z n

(take molar mass of

Z n

Q. Aluminium reacts with sulphuric acid to form aluminium sulfate.
Write the molecular formula of aluminium sulphate.

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