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1.00 g of a hydrated salt contains 0.201...

`1.00 g` of a hydrated salt contains `0.2014 g` of iron, `0.1153 g` fo sulphur, `0.2301 g` of oxygen and `0.4532 g` of water of crystallisation. Find its empirical formula. `(Fe = 56, S = 32, O = 16)`

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The correct Answer is:
B, D
`{:("Element", "Moles", "Least ratio"),(Fe, (0.201)/(56) = 0.0036,(0.0036)/(0.0036) = 1),(S, (0.1153)/(32) = 0.0036, (0.0036)/(0.0036) = 1),(O, (0.2301)/(16) = 0.0143, (0.0.143)/(0.0036) = 3.97 ~~ 4),(H_(2) O, (0.4532)/(18) = 0.025, (0.025)/(0.0036) = 6.94 ~~ 7):}`
Empirical formula is `FeSO_(4).7H_(2) O`.
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