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Write down the names of compounds represented by the following formulae: (i) Al2(SO4)3 (ii) CaCl2 (iii) K2SO4 (iv) KNO3 (v) CaCO3

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(i) Al2(SO4)3 → Aluminium sulphate (ii) CaCl2 → Calcium chloride (iii) K2SO4 → Potassium sulphate (iv) KNO3 → Potassium nitrate (v) CaCO3 → Calcium carbonate
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(i) Al2(SO4)→ Aluminium sulphate

(ii) CaCl→ Calcium chloride

(iii) K2SO→ Potassium sulphate

(iv) KNO→ Potassium nitrate

(v) CaCO→ Calcium carbonate

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It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of oxygen gas required to react completely with 1 g of hydrogen gas is 8 g. Therefore, the mass of oxygen gas required to react completely with 3 g of hydrogen gas is 8 × 3 g = 24 g.
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