Question

3 x 1023 molecules of element Z have a mass of 38 g. What is the mass of 1 mole?

Answer 1

Answer:

76.3 g of 1 mole of element Z

Explanation:

According to Avogadro’s number the number of particles in 1 mole of a substance is 6.023 x 10²³.  

The mass of 3 x 10²³ particles is 38g  

Therefore, the mass of 6.023 x 10²³ is $\frac{ 38 g x 6.023 x 10^2^3}{3 x 10^2^3}$ = 76.3 g

Answer 2

38 g / (3 x 10^23 molecules) * 6,02x10^23 molecules/mol = 76,25 g/mol.