Thermodynamics

What are the state variables of a gaseous system?

• P → Pressure

• V → Volume

• n → Number of moles

• T → Temperature

What are extensive properties? What type of properties do you get when you add, subtract, multiply, divide and differentiate these same type of properties?

• These are properties that depend on the amount of matter present in the substance. Ex:- Volume, number of moles etc

• add, subtract, multiply → Extensive property

• divide and differentiate → Intensive properties

• If you divide an extensive property with an intensive property, you will get an extensive property

What are intensive properties?

These are properties that are fixed regardless of the matter present in the substance. Ex:- Lustre, Melting point

What are state functions?

These are properties that depend only on the initial and final states, not on the process used to get there.

What are path functions?

These are properties that depend on the initial and final states, not as well as the path taken for completing those processes

What is internal energy at the macroscopic level

It is a function of Temperature and Volume

How much is 1 Liter atm in joules?

101.3 Joules

How much is 1 Liter bar in joules?

100 Joules

What will be the formulae in the ideal gas equation for change in volume w.r.t the number of moles?

P ∆V = ∆n_g*R*T

Where,

P → Pressure

V → Volume

∆n_g → Difference between the Number of gas moles of the product to the number of moles of the reactants => n_p - n_r

_{It is like final - initial, but for chemistry}

R → Universal gas constant

T → Temperature

How much is 1 litre bar in kilojoules?

0.1 kJ

What is enthalpy? What is its formula?

It is the heat change at constant pressure
=> Q _final - Q _initial

∑ Enthalpy _final - ∑ Enthalpy _initial

What is the formula for the relation between Cp; Cv; nCp, m; nCv, m

What des Poisson’s ratio tell us?

It tells us the number of atoms present in a molecule