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Question:
how can we find the no. of atoms in CuSO4.5H2O
Answer:

As a standard of Avogadro constant,

1 mole of CuSO4.5H2O has 6.023 x 1023 molecules. 1 molecule of CuSO4.5H2O has 21 atoms (Cu =1, S = 1, O = 9, H = 10).

Thus, 1 mole of CuSO4.5H2O will have 6.023 x 1023 x 21

= 1.26 x 1025 atoms.

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