Question

• THREE MARK QUESTIONS
19. Calculate the number of electrons present in 9 g of H,O ?

Answer 1

Explanation:

given mass of h2o = 9g

actual mass =18g

no. of moles = 9/18

= 1/2

no. of molecules = no. of moles × avagadro no.

so, no. of molecules = 1/2×6.022 ×10^23

=3.011×10^23

no. of electrons = no. of molecules × no. of electron present in molecule

= 3.011×10^23 × 10

=3.011×10^24

hope it helps u!!