Q.

The weight of 1  ×  1022 molecules of CuSO4.5H2O is

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a

41.59 g

b

415.9

c

4.159 g

d

None of these

answer is C.

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Detailed Solution

[∵  Molecular weight  of CuSO4.5H2O=63.5 +  32 + 64 + 90  = 249.5]6  ×  1023  molecules has  weight = 249.5 g1  ×  1022  molecules has  weight = 249.5 ×  1  ×  10226  ×  1023=4.158
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The weight of 1  ×  1022 molecules of CuSO4.5H2O is