How many moles of atoms are in each elemental sample?

(a) 1.34 gZn

(b) 24.9 gAr

(c) 72.5 gTa

(d) 0.0223 g Li

Solution 29P

Here, we have to determine the number of moles of atoms are in each elemental sample.

(a) 1.34g Zn :

Molar mass of Zinc(Zn) = 65.38 g/mol.

This means 1 mol of Zn is 65.38g .

To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn.

=

= 0.020 mole

Hence, 1.34 g of Zn contains 0.020 moles of Zinc.

(b) 24.9g Ar :

Molar mass of Argon(Ar) = 39.948 g/mol.

This means 1 mol of Ar is 39.948 g .

To find the number of moles of Ar, we divide the given amount of Ar by the molar mass of Ar.

=

= 0.623 mole

Hence,...