ICSE 2004 : SCIENCE Paper 2 (Chemistry) - Question 5(a) & (b) Answer the following.

SCIENCE
Paper 2 (Chemistry) - 2004
(One hour and a half)

Question 5
(a) A flask contain 3.2g of sulphur dioxide. Calculate the following:

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53.
(i) The moles of sulphur dioxide present in the flask.

54.
(ii) The number of molecules of sulphur dioxide present in the flask.

55.
(iii) The volume occupied by 3.2g of sulphur dioxide at S.T.P.
(S = 32, 0 = 16)

56.
(b) The reaction of potassium permanganate (VII) with acidified iron (II) sulphate is given below:
2KMnO₄+ 10FeSO₄ + 8H₂SO₄ → K₂SO₄+ 2MnSO₄ + 5Fe₂(SO₄)₃ + 8H₂O
If 15.8g of potassium permanganate (VII) was used in the reaction, calculate the mass of iron (II) sulphate used in the above reaction.
(K = 39, Mn = 55, Fe = 56, S = 32, 0 = 16)

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