CALCULATE THE PERCENTAGE LOSS OF MASS OF AQUEOUS COPPER SULPHATE, WHEN IT IS COMPLETELY DEHYDRATED BY CONC. SULPHURIC ACID
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Answer:
Explanation:
What is the formula of Hydrated Copper sulphate?
It is CuSO₄.5H₂O
Now, molecular mass of 1 crystal of copper sulphate is:
64 + 32 + (4x16) + 5(2x1 + 16)
= 96 + 64 + 5x18
= 160 + 90
= 250.
Now, Find out the mass of copper sulphate when 5 molecules of water of crystallization is removed:
It is CuSO₄
= 64 + 32 + (4x16)
= 96 + 64
= 160.
What is the loss in mass?
It is (250 - 160) = 90g
Now, what is the percentage loss in mass?
Original mass was 250g. So, we will take it in our calculation.
Percentage loss =
90/250 * 100/1
= 0.3 * 100%
= 36%
Hence, percentage loss in mass is 36%
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