Thermodynamics ...

Statement-1: A process is called adiabatic if the system does not exchange heat with the surroundings.

Statement-2: It does not involve increase or decrease in temperature of the system.

Temperature of 5 moles of a gas is decreased by 2 K at constant pressure. Which of the following statement is correct?

The enthalpy change for the hydration,

CuSO_4(s) + 5H₂O_(g)  → CuSO₄.5H₂O_(s)

is - 71.50 kcal mol^-1. If enthalpy of vaporization of water is 10.5 k cal mol^-1 at 25° C, what would be enthalpy change for the hydration,

CuSO_4(s) +5H₂O_(l)  → CuSO₄.5H₂O_(s)

A gas absorbs 200 J heat and undergoes simultaneous expansion against a constant external pressure of 10⁵ Pa. The volume changes from 4L to 5L. Find the change in internal energy.

Statement-1: At constant temperature and pressure whatever heat absorbed by the system is used in doing work.

Statement-2: Internal energy change is zero.

The heat of sublimation of iodine is 24 cal g^–1 at 50°C. If specific heat of solid iodine and its vapour are 0.055 and 0.031 cal g^–1 respectively, find the heat of sublimation of iodine at 100°C.

If ΔH and ΔE are the change in enthalpy and change in internal energy respectively for a gaseous reaction, then