21 Chemistry -- Stoichiometry

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?

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

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