Question

The weight of an atom is 7×10^-23 gm. Hence its atomic mass is 1) 42 amu 2) 42 g 3) 420 g 4) 420 amu

Answer 1

The mass of one atom of an element A = 7×10⁻²³ gm

We know the 1 mole of an atom = 6.023 x 10²³ atoms

1 mole of an atom = its atomic mass

Mass of one atom of an element A = is 7×10⁻²³ g g

Mass of 6.023 x 1023 atoms of an element A =  is 7×10⁻²³ g X6.023 x 10²³

                                                                               = 42.16100 grams