Question

A sample of fe2+ contains 8 x 10^5 coulomb charge.Find out weight of sample.

Answer 1

Explanation:

1 e =1.6×10^-19c

2e=2×1.6×10^-19=3.2×10^-19c

charge of 1 ion of fe2+ is 3.2×10^19c

total charge =8×10^5c

now we will find no of moles o fe2+ ion

n×3.2×10^-19=8×10^5

n=8×10^5/3.2×10^-19=2.5×10^24moles of fe 2+ions

moles=mass/molar mass

2.5×10^24=mass/55. 845

mass=139.6125×10^24g