Q. 314.7( 3 Votes )

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 :

(a) The atomic mass of carbon atoms: 12

Thus, the mass of 5 moles of carbon atoms carried by Raunak:


m = Number of moles X Molar mass of given sample


= 5 × 12 = 60g


The atomic mass of sodium atoms:23


Thus, the mass of 5 moles of sodium atoms carried by Krish =


m = 5 ×23 = 115g


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


(b) The number of atoms = (Given mass)/(Molar mass)


(i) Raunak container (5 moles of carbon atoms):


Number of atoms =


(ii) Krish container (5 moles of sodium atoms):


Number of atoms =


Both containers have the same number of atoms.


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