Question

Maximum number of electrons is present in $O_2$

• A. 2.24 lit. of SO2 at S.T.P
• B. 0.2 moles of NH3
• C. 1.5 gm moles of oxygen
• D. 2 mole atoms of of sulphur

Answer 1

Answer: (D)

1. No. of electrons = Number of moles $\times$ Avogadro number

2. From the above equation we can see, that the number of electrons depends on the number of moles.

3. The species that has the maximum number of moles has the maximum number of electrons.

4. Number of sulphur is given is 2

5. Number of electrons in 2.24 lit. of $SO{}_2$ at S.T.P is

2.24 lit of ​$SO{}_2$ is 0.1 mole of it at STP and contains $\frac{N_A}{10}$ ​​ molecules

Hence, the Total no. of electrons in one $SO{}_2$ ​ molecule is 32.

6. Total electrons in one molecule of $NH{}_3$ ​=10
Thus, 0.2 moles contain $0.2\times N{}_A$ ​ molecules and total electrons = $2\times N{}_A$

7. Total electrons in oxygen atom =8.
1.5 moles of oxygen contain $1.5\times N_A$ atoms
Total electrons = $1.5\times N_A\times 8$ = $12\times N{}_A$

8. Since 1 atom of Sulphur has 16 electrons.

Therefore total electrons in 1 mole = 1 x NA​ x 16.
Thus, 2-mole atoms contain 32×NA​ electrons.

Conclusive statement-

From the above discussion, it can be seen that 2-mole of sulphur has the maximum number of electrons.