Question

Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of the same weight.
a) Whose container is heavier?
b) Whose container has more number of atoms?

Answer 1

(a) 1 mole = molar mass of a substance.

∴ 1 mole of carbon atoms weigh = 12g

∴5 moles of carbon atoms will weigh = 12 x 5 = 60 g

Hence, Raunak’s container has weigh = 60 g In the same way,

∴ 1 mole of sodium atoms weigh = 23g

∴ 5 moles of sodium atoms will weigh = 23 x 5 = 115 g

Hence, Krish’s container has weigh = 115 g

Thus, Krish’s container is heavier than Raunak’s container.

As, 1 mole = 6.022 x 1023 atoms


(b)Here, both containers have 5 moles of each carbon and sodium, therefore, both containers have equal number of atoms,
5 x 6.022 x 1023 atoms,
or 3.011 x 1024 atoms in each.

Answer 2

Required answer:

Number of moles of carbon in Raunak's container = 5 mol

Weight of 1 mol of carbon atoms = 12

Now , Weight of 5 moles of carbon atoms = 12 × 5 = 60 g

Number of moles of sodium in krish's container = 5 moles

Weight of 1 mol of Sodium = 23 g

Now , Weight of 5 moles of sodium = 23 × 5 = 115 g

By observing the above calculations . We can say that Krish's container is heavier compared to Raunak's container.

And Now ,Coming to the number of atoms ;

Product of number of moles of substance and avogadro number (6.023×10²³) gives the number of atoms in that substance.

The number of moles of both taken atoms is same. So , Number of atoms will also be same.

Hence ,

Krish's container is heavier compared to Raunak's container and Number of atoms present in both containers is same.