The mass of hydrated salt X is 124.5 grams and that of anhydrous salt as 88.5 grams. How many moles of water of crystallisation are present?

2.5 moles

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2 moles

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1.5 moles

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1 mole

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Solution

The correct option is B
2 moles

2 moles

1 mole of water is 18.0 grams and mass of anhydrous salt is [124.5 - 88.5] = 36 grams

Moles of water present in 36 grams of water = (36 / 18) = 2

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