Question

Estimate the no. of electrons in 100gm of water?How much is the total negative charge on these electrons?​

Answer 1

So, 100 gram of H2O contains =100×186. 022×1024 number of electrons. Total negative chargecarried by these electrons =181. 6×10−19×100×6.

Answer 2

1 molecule of H20 contains 10 electrons. (8 from oxygen and 2 from two hydrogen atoms).

So, 100 gm of H20 means 5.55 × 6 × 10^23 molecules of H20.

So, total number of electrons in 100gm of H20 = (5.55 × 6 × 10^23) × 10 electrons = 3.33 × 10^25 electrons.

Therefore, total negative charge carried by there electrons = (1.6×10^-19) × 3.33 × 10^25 Coulomb.

= 5.32 × 10^6 Coulomb of Charge.