Was taken 145.8 g of a simple substance X. It is known that this mass contains 3.24X1024

Was taken 145.8 g of a simple substance X. It is known that this mass contains 3.24X1024 atoms of this substance. What is substance X?

Let’s find the amount of substance X:

v (X) = N (X) / Na = (3.24 * 10 ^ 24) / (6.02 * 10 ^ 23) = 5.382 (mol).

Let’s find the molar mass of substance X:

M (X) = m (X) / v (X) = 145.8 / 5.382 = 27 (g / mol), which corresponds to the metal aluminum (Al), thus the unknown substance X is aluminum.