Question

Deduce the number of molecules in 90grams of water

Answer 1

Answer:

H20 has one oxygen atom with a mass of 16 and two hydrogen atoms each with mass of 1. So the mass of H20 is 18. Knowing Avogadro's constant, 18 grams of H20 would have 6.022E23 molecules. Since there are 90 grams, that is 3E24 molecules.

Explanation:

hope it may helps you...

Answer 2

Answer:

3.010*10**24

Explanation:

In 90 gram of h2o

There are

5*6.02*10**23=30.10*10**23

=3.010*10**24 molecules of h2o; and that is also the number of oxygen atoms