Home/Class 12/Physics/

## QuestionPhysicsClass 12

Assume that each atom in a copper wire contributes one free electron. Estimate the numberof free electrons in a cpper wire having a mass of 6.4g (take the atomic weight of copper ot be 64g $${m}{o}{l}^{{-{1}}}.$$

64 grams of copper have 1 mole.
So, 6.4 grams of copper have 0.1 mole
$${N}\odot{o}{f}{a}\to{m}{s}\in{0.1}{m}{o}\le={\left({6}\times{10}^{{-{{23}}}}\times{0.1}\right)}$$
$${a}\to{m}{s}={6}\times{10}^{{22}}{a}\to{m}{s}.$$
Since 1 atoms contributes 1 electron
$${S}{o}{6}\times{10}^{{22}}{a}\to{m}{s}{c}{o}{n}{t}{r}{i}{b}{u}{t}{e}{s}{6}\times{10}^{{22}}{e}\le{c}{t}{r}{o}{n}{s}.$$