Solution:

Heat and work are both path functions since to bring a particular change in the system the amount of heat and work required will be different in different paths, but by first law of thermodynamics we can say the difference between them is a point function.

Solution:

The given number of component $$= 2$$
Given number of phases $$= 2$$
We know, $${\text{degree of freedom (number of independent variables) }} = C - \phi + 2$$
$$\left( {{\text{assuming no reaction taking place}}} \right)$$
$$f = 2 - 2 + 2 = 2$$
And since under azeotropic conditions the composition of a component in both the phases remains same one of the independent variable becomes dependent and hence the degree of freedom reduces to 1.

Solution:

The given number of component $$= 2$$
Given number of phases $$= 2$$
We know, $${\text{degree of freedom (number of independent variables) }} = C - \phi + 2$$
$$\left( {{\text{assuming no reaction taking place}}} \right)$$
$$f = 2 - 2 + 2 = 2$$
And since under azeotropic conditions the composition of a component in both the phases remains same one of the independent variable becomes dependent and hence the degree of freedom reduces to 1.

Solution:

At the triple point all the three physical phases coexist in equilibrium. And at this point the degree of freedom is zero.

Solution:

Since at reduced conditions all the substances behaves more or less same we can say that the critical compressibility of two substances is also more or less same.

Solution:

Definition: one ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one day.

Solution:

Since a perfect gas can also be considered as an ideal gas and for ideal gas hence at constant pressure the temperature remains constant and for ideal gas since enthalpy is solely a function of temperature we can say enthalpy is zero.