Question

calculate the number of water molecules present in one drop of water which weighs 1.8gram​

Answer 1

Explanation:

explanation

1. molecules in a water drop =(6.022×102^3
2. (molecules/mole)×0.002275 moles.
3. molecules in a water drop =1.67×10^21
4. molecules of water .

Answer 2

Explanation:

We have,

• Given mass = 1.8 g

We know that,

No. of moles = Given mass/molar mass

• molar mass (H2O) = 2+16=18 g

= 1.8/18 = 0.1 moles

No. of water molecules = 0.1×6.022×10^23

= 6.022×10^22