Question

When 20 ml o acetone and 30 ml of benzene is mixed together .then whats the final volume
a)48ml b)50 ml
c)52ml d)49 ml

Answer 1

Answer:

50 ml is the final volume.

Answer 2

Answer:

The final volume of solution of acetone and benzene will be equal to 52ml.

Therefore, the option (c) is correct.

Explanation:

• A solution which do not obey the Raoult's law over the entire range of temperature and pressure is called non-ideal solution.
• A few solutions obey the Raoult's law. Most of the solution show deviations from the ideal behavior in their vapor pressure.
• If the escaping tendency of A and B types of molecules from the solution  is more than from the pure form. This indicates the A-B interactions are weaker than A-A and B-B in pure liquids. The each component of the solution has partial vapor pressure greater than the expected vapor pressure on the basis of Raoult's law. Thus  the positive deviations shown by such solution.
• The enthalpy of mixing $\triangle H_{mix}$  is positive and volume of mixing $\triangle V_{mix}$ is also positive. Because of the decrease of the intermolecular forces between the molecules. The volume of increase on mixing.
• When acetone and benzene are mixed together. They will show positive deviations. Therefore the volume of mixing will be positive.

        $\triangle V_{mix}= +ve$

       Total volume of solution = 20 + 30= 50ml

Therefore, the final volume will be greater than 50ml. So, from the given options, it could be only 52ml.