Mass of 2 x 1021 number of atoms of an element is 0.4g. What is the mass of 0.5 mole of the element?
Given,
No. of atoms of an element = 2 x 1021
Mass of atoms of an element = 0.4g
According to the questions,
2 x 1021 atoms of an element has mass 0.4g
6.022 x 1023 atoms of element has mass = 120.44g
i.e. 1 mole of atom of an element has mass 120.44g
Hence, the mass of 0.5 mole of an elements is 0.5 x 120.44g = 60.22g