Question

How many molecules are present in?
(a) 9 g. of water (Atomic mass of H=1u, O=16u)

Answer 1

Answer:

9 grams of water is 1/2 mole which is… 3.012 x 10^23 molecules.

Answer 2

Explanation:

Atomic mass of H=1u,O=16u

We know that molecular formula of water is H2O

Now,no.s of molecules=given mass/molar mass

So,

H2=2g & O=16g

H2O=2+16=18g/mole

hence,n=9g/18gmole^-1

=0.5molecule..