Question

Number of atoms present in 7.1 g of Cl 2 is :-
A
0.1 NA
B
0.2 NA
NA
C
0.5 Na
D​

Answer 1

Answer:

0.2 Na

Explanation:

Mass of Cl2​,W=7.1 g

Molar mass of Cl2​,M=71g/mol

Number of moles x,=MW​=70g/mol7.1g​

                                  =0.1mol

Each Cl2​ molecule contain 2 atoms.

∴ Number of Cl2​ atom , N=2×n×NA​

                                             =2×0.1×NA​

                                              =0.2NA​

Answer 2

Answer:

B)

0.2 NA

Explanation:

Mass of Cl2 ,W=7.1 g

Molar mass of Cl2 ,M=71g/mol

Number of moles x,= W/M

7.1g/70g mol

=0.1mol

Each Cl2 molecule contain 2 atoms.

∴ Number of Cl2 atom , N=2×n×NÂ

. =2×0.1×NA

=0.2NA