Question

sulphur burns in oxygen to give sulphur dioxide .if 16g of sulphur burns in 'x'cc of oxygen . calculate the amount of potassium nitrate which must be heated to produce 'x' cc of oxygen.[S=32, K=39, N=14,O=16]

Answer 1

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S      +   O2   → SO2
1mol    1mol        1mol

​Moles of S reacted = 16g/32g/mol = 0.5 mol
0.5 mol of S needs 0.5 mol of Oxygen,

{To complicate the question x cc is mentioned in the question, which has no significant use.}
So we know that Sulphur burns in 0.5 mol Oxygen.

The thermal decomposition of Potassium nitrate :
2KNO3  →  2KNO2 + O2
2mol                             1 mol

​[2 x 101g]                    32g O2


1 mol of O2 is produced by 2 mol of KNO3
​0.5 mol will thus be produced by 1 mol of KNO3

Thus 1mol of KNO3 is required to produce the given amount of Oxygen.
1mol of KNO3 = molar mass of KNO3 = 101g
Hence 101g of KNO3 is required.

Answer 2

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