Question

what is the number of water molecule cotaiined in a drop of water weighing 0.06g?

Answer 1

$\textbf{\huge{\underline{ Hello Mate! }}}$

Since we know that,

Number of molecules = No. of moles × Avagrado number.

And, No. of moles = W g / ( W g/mol )

In H2O, molar mass = ( 1 × 2 + 16 ) u = 18 u ( g/mol )

Molar mass of H2O = 0.6 / 18

= 0.03 moles

No. of molecules = 0.03 × 6.022 × ${10}^{23}$

= 0.181 × ${10}^{23}$ or 1.81 × ${10}^{22}$

$\textsf{\red{0.6 g of H2O have 1.81 * 10 raised 22 molecules}}$

$\textbf{ Have great future ahead! }$