calculate the no. of atoms in 16 moles of He and 16g of He

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Solution

1) 1 mole of atom = 6.023 x 10²³
No of atoms in16 moles of He = 16 x 6.023 x 10²³= 9.6 x 10²⁴ atoms
2) Atomic wt. of He = 4 gram = 1mole atom
No. of moles in 16 gram He = given mass / atomic mass = 16 g/ 4 g = 4 mole = 4 x 6.023 x 10²³= 2.4 x 10²⁴ atoms of He

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Calculate the number of atoms in each of the following :
(a) 52 moles of He,
(b) 52 Amu of He,
(c) 52 g Of He.

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