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Hard Water

On analysis i...

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On analysis it was found that FeS contains 36.47% of sulphur . How much FeS will be obtained on heating a mixture of 1.0 g of Fe and 2.0g of S? How much sulphur remains in decomposed?

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Q. A student heats calculated amounts of iron filings and sulphur powder together in a boiling tube. He will obtain :
(1) a homogeneous mixture of Fe and S
(2) a heterogeneous compound of Fe and S
(3) a homogeneous compound of FeS
(4) a heterogeneous mixture of FeS, Fe and S

F e + S \to F e S

I

0.5 m o l

F e

0.6 m o l

S

0.6 m o l

F e S

will be formed.

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. Limiting reactants determine how much of a product will be formed.

Q. A compound AB completely decomposes into A and B on heating. 50 g of AB, on strong heating, gave 40 g of A. How much quantity of AB should be decomposed by heating to obtain 2.5 g of B? How much quantity of A will be produced in the process?

Q. A container contains 10 litres mixture in which there is 10% sulphuric acid. How much sulphuric acid is to be added to make the solution to contain 25% sulphuric acid?

1.00

g of a hydrated salt contains

0.2014

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0.2301

g of oxygen and

0.4532

g of water of crystallisation. How much water molecules are present in its empirical formula?

(F e = 56; S = 32; O = 16)

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