Answer:
Mass = 74.9 g
Explanation:
Given data:
Number of atoms of arsenic = 6.02×10²³ atoms
Mass of arsenic = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022× 10²³ is called Avogadro number.
one mole = 6.02×10²³ atoms
So number of moles of arsenic are 1 mol.
Mass of arsenic:
Mass = number of moles × molar mass
Mass = 1 mol × 74.9 g/mol
Mass = 74.9 g
