Question

Find no of atoms in 20gram atom He

Answer 1

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Now, molar mass of He = 4 g/mol

No. of moles of He  = 20/4 = 5 moles

one mole contains 6.022 x 10²³ atoms

5 moles contain: 5 x 6.022 x 10²³ = 30.11 x 10²³ atoms