Amixture of two gases exerts a total pressure of 3.65 atm. if the partial pressure of one of the gases is 1.86 atm, what is the partial pressure of the other gas in the mixture?
answer
0.510 atm
1.79 atm
1.96 atm
6.79 atm

if 45 g of lif are dissolved in 1.8 kg of water, what would be the expected change in boiling point? the boiling point constant for water (kb) is 0.51 °c/m.
answer
0.49°c
0.98°c
1.9°c
3.5°c

1. 1.79 atm

2.

Explanation:

1. According to Dalton's law, the total pressure of a mixture of gases is the sum of individual pressures exerted by the constituent gases.

Given:

Thus

Thus the partial pressure of the other gas in the mixture is 1.79 atm

2.

Elevation in boiling point is:

=  elevation in boiling point

i = Van'T Hoff factor  

= boiling point constant

m = molality  

For , i= 2 as it dissociates to give two ions.

The expected change in boiling point is