Question

1 gram of hydrogen contains 6x10*23 atoms then 4 grams of he contains

Answer 1

Since atomic weight of H is 1 u, 1 g means 1 mole.

1 mole of Hydrogen contains 6*1023 atoms.

No of moles in 1 g of He = 1/4 = 0.25 mol

No of atoms in one mole = 6*1023

No of atoms in 0.25 moles = 0.25*6*1023 = 1.5*1023 atoms

hope it helps !!

Answer 2

Answer:

Explanation: 1 gram of hydrogen = 1mole

Why because

We know that

No. Of moles = weight of element/atomic weight

i.e 1 gram of hydrogen contains 6×10 23 atoms

1 gram of he contains moles = 1/4=0.25

4 grams = 1/4×6×10 23/4=6*10 23 atoms