Question

Calculate the number of molecules of H2O in 100cc of H2O. If its density is 0.981g/cc at the given temperature 300k.

Answer 1

Answer:

2.8x10^20

Explanation:

22400ml contains 6.02x10^23

100ml............ 6.02x10^23x100/22400

=2.8x10^20

Answer 2

Answer:

5.45NA

Explanation:

MASS =DENSITY × VOLUME

MASS=0.981× 100

= 98.1

NO. OF MOLECULES = 18 MOLES OF WATER( H2O)

A/C TO FORMULA

MOLECULES =GIVEN MASS / MOLAR MASS× 6.022× 10^23

= 98.1 ×NA/18. (6.022× 10^23= NA)

= 5.45NA

HOPE IT HELPS

PLEASE MARK AS BRAINLIST