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Depression in Freezing Point

4.A sample of...

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4.A sample of copper sulphate pentahydrate ,CuSO4.5H2O contains 3.782g of Cu. How many grams of oxygen are in this sample.

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C u S O_{4} \cdot 5 H_{2} O

3.782 g

C u

. How many grams of oxygen are in this sample?

(C u = 63.5)

Q. Question 39
A gold sample contains

90 %

of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?

Q. A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold? (Atomic mass of gold is 197).

Q. A substance contains

35.0 g

5.05 g

60.0 g

oxygen. How many grams of oxygen are there in a

200 g

sample of the substance?

Q. How many molecules of water are present in one formula unit of copper sulphate pentahydrate?

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