The mass of one atom of an element X is 2.0 Γ 10β23 g.(i) Calculate the atomic mass of element X.(ii) What could element X be?
Mass of an atom of element X = 2.0 × 10-23g
The mass of an atom of a substance is equal to the mass of 1 mole of that substance.
As 1 mole of a substance consists of 6.022 × 1023 atoms; therefore, the mass of an atom of a substance is equal to the mass of 6.022 × 1023 atoms.
Therefore, to calculate the atomic mass of element X, we need to calculate the mass of 6.022 × 1023 atoms of X.
Mass of 1 atom of X = 2.0 × 10-23
Mass of 6.022 × 1023 atoms of X
= 6.022 × 1023 × 2.0 × 10-23
= 12 u
As Carbon has an atomic mass of 12 u; therefore, element X is carbon.
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