MCQ

Mole Concept

By Sakshi Goel | 18 May'20 | 966 Views

MCQ

Problem:
Which has the maximum number of atoms?
(a) 10.8 g of Ag
(b) 2.4 g of C
(c) 5.6 g of Fe
(d) 54 g of Al

Solution:

The best way is to convert all the options into the moles.
Option (a) 10.8 g of Ag: 108 g of Ag = 1 mole
10.8 g of Ag = 10.8/108 = 0.1 mol
Option (b) 2.4 of C: 12 g of C = 1 mole
2.4 g of C = 2.4/12 = 0.2 mol
Option (c) 5.6 g of Fe: 56 g of Fe = 1 mole
5.6 g of Fe = 5.6/56 = 0.1 mol
Option (d) 54 g of Al: 27 g of Al = 1 mole
54 g of Al = 54/27 = 2.0 mol
More is the number of moles, more are the number of atoms.
So, correct option is (d).