Question

11. 3.2 of oxygen (At.wt. = 16) and
16) and 11
0.2g of hydrogen (At.wt. = 1) are
placed in a 1.12 litre flask at 0°C.
The total pressure the gas mixture
will be
1) 1 atm
2) 4 atm
3) 3 atm
4) 2atm​

Answer 1

Answer:

The molecular weights of oxygen and hydrogen are 32 g/mol and 2 g/mol respectively.

The number of moles of oxygen =

32g/mol

3.2g

=0.1mol.

The number of moles of hydrogen =

2g/mol

0.2g

=0.1mol.

Total number of moles =0.1+0.1=0.2 moles.

Total pressure P=

V

nRT

=

1.12L

0.2moles×0.08206Latm/molK×273.15K

=4atm

Thus, the total pressure in atm of the gas mixture will be 4 atm.