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JEE Main Chemistry question

ChemistrySome Basic Concepts of ChemistryJEE Main

A sample of copper sulphate pentahydrate contains 8.64 g of oxygen. How many grams of Cu is present in this sample? (Atomic mass of Cu = 63.6, S = 32.06, O = 16)

Answer: (B)

Solution

CuSOHO has 1 Cu and 9 O atoms per formula unit (4 from sulfate + 5 from water), so the mass ratio Cu : O is

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Question ID VK-130587