Question

calculate the number of moles is 52g of He (Helium)

Answer 1

We know that 1 molecule of Helium is equal to 4 gram.

So we can write that 1 mole = 4 g

Or, 4 g = 1 mole = 6.022 X 10 ²³ atoms

 So, 1 g = ¼ mole = (6.022 X 10 ²³)/4 atoms

52 g = ¼ X 52 mole = [(6.022 X 10 ²³)/4] X 52 atoms

        = 13 mole = 7.8286 X 10 ²³

Thus 52 grams of He has 13 molecules.

Answer 2

Answer:

given mass = 52g

molar mass = 4g

n= m/M

n = 52/4

n= 13

13 mole