Answer to Question #65811 in Physical Chemistry for umar

Question

Question 3 : Which of these is not an extensive property of a system?
Mass
Energy
Density
Volume

Question 4 : Which of the following statements about enthalpy is incorrect?

Δ
H
ΔH
is the enthalpy change at constant pressure
Reactions which absorb heat have a positive DH
Enthalpy and internal energy of a system are always identical
enthalpy is a state function

Answer 1

Question 3: Extensive property are mass, energy, volume. So the correct answer: density.

Question 4: Enthalpy and internal energy of the system are not always identical, only under certain conditions defined. So the correct answer: enthalpy and internal energy of a system are always identical.

Answer:
Question 3: density;
Question 4: enthalpy and internal energy of a system are always identical.