Question

Find total negative charge on 2 g of H2

Answer 1

Explanation:

A water molecule (H

2

O) contain no. of proton (np)=8+2×1=10 and so no. of electrons =20

Electroneutrating principle statter state

net positive charge = net negative charge

As L cup of water holder 250 g water,

no. of moles =

molar mass

given mass

=

18

250

=

9

125

moles

1 mol of water contains N

A

no. of molecular

⇒ Total no. of molecular =

9

125

×6.02×10

24

=8.361×10

24

so, net positive charge present =20×8.361×10

24

×1.6×10

−19

(charge of photon)

⇒ Q=2.68×10

7

C

Thus, net negative charges presents =−Q

=−2.68×10

7

C