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Calculate the number of atoms present in: 1) 52 moles of helium 2) 52g helium
(1) Number of atoms in 1 mole of He = 6.022×1023
:.Number of atoms in 52 mole of He  = 52 × 6.022×1023
                                                            = 3.131 × 1023

(b) We know that,
Atomic mass of He = 4
:. As per mole-concept
Number of atoms in 4 g of He     = 6.022 × 1023
:.Number of atoms in 52 g of He = (6.022 × 1023× 52)/4

                                                     = 7.829 × 1024


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