Question

5. Calculate the number of molecules in 3 gm of water.
5. The wavelength of first spectral line in Balmer seried is 6​

Answer 1

Answer:

1. The mass of H2O is 18 gm

in 18 gm of H2O - molecules present are 6.022×10^23

in 1 gram of water- molecules present are 6.022×10^23 divided by 18

and in 3 gm of water - molecules present are 6.022×10^23/18 multiplied by 3