. The mass of a single atom of an element X is
2.65 x 10-23 g. What is its atomic mass? What would this element be?
Ans: We know that : 1 mole of atoms = 6.022 x 1023 atoms = Atomic mass in g
Mass of 1 single atom of element = 2.65 x 10-23
Mass of 6.022 ´ 1023 atoms of element = 2.65 x 10-23 x 6.022 x 1023 g
= 15.96 = 16 u
Hence, the atomic mass of the element X is 16 u
The element with atomic mass 16 is oxygen. Therefore, X is O.