Question

1.5 into 10^22 atoms of an element weight 0.9 grams atomic mass of the element in AMU is a 36,b 18,c 54,d72

Answer 1

The Avogadro's number = 6.022x10^23

1 mole of an element has 6.022x10^23 atoms


Number of moles in 1.5x10^22 atoms = (1.5x10^22)/(6.022x10^23)

                                      = 2.5 x 10^-2

                                        = 0.02moles


Atomic mass = Given mass/Number of moles


                     = 0.9/0.025

                     = 36
answer is option (a)

Answer 2

Answer:

36

Explanation:

Use Avogadro's number