Question

If 3x10^20 molecules are removed from 20 gms of hydrogen gas, the number of moles left is​

Answer 1

Answer:

Correct option is

D

0.5×10

−3

mol

Molar mass H

2

SO

4

= 98 g/mol.

98 mg H

2

SO

4

=

1000mg/g×98g/mol

98mg

=0.001 moles.

3.01×10

20

molecules of H

2

SO

4

=

6.02×10

23

3.01×10

20

=0.0005 moles.

Number of moles of H

2

SO

4

remaining =0.001−0.0005=0.0005=0.5×10

−3

moles.