Question

The atomic weight of copper is 63.5. What will be the total number

Answer 1

Given :

The atomic weight of copper is 63.5 gm.

To Find :

The total number  of gram atoms and number of atoms present in 100 gram of copper.

Solution :

We know, 1 gram atom is equal to mass of one mole of copper i.e. 63.5 gm.

So, number of gram atom in 100 gram of copper is :

n = 100/63.5

n = 1.57 gram atom

Now, number of atoms on gram atom is :

$A = 6.022\times 10^{23}\times 1.57\\\\A = 9.45\times 10^{23}\ atoms$

Therefore, total number  of gram atoms and number of atoms present in 100 gram of copper is 1.57 gram atom and $9.45\times 10^{23}\ atoms$.

Hence, this is the required solution.