Question

The mass of 1.5×1022 atom of an element is 0.65 then atomic mass of the element is

Answer 1

the Avogadro's number = 6.022x10^23

1 mole of an element has 6.022x10^23 atoms

Number of moles in 1.5x10^22 atoms = (1.5x10^22)/(6.022x10^23)

                                                            = 2.5 x 10^-2

                                                            = 0.025 moles

Atomic mass = Given mass/Number of moles

                     = 0.9/0.025

                     = 36

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