Thermodynamics ...

In a closed container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true ?

Two moles of helium gas expanded isothermally and irreversible at 27°C form volume 1 dm³ to 1 m³ at constant pressure of 100 k Pa. Calculate the work done.

The sublimation energy of I₂ (s) is 57.3 kJ / mol and the enthalpy of fusion is 15.5 kJ / mol. The enthalpy of vaporisation of I₂ is

When two moles of hydrogen expands isothermally against a constant pressure of 1 atm, at 25° C from 15 L to 50 L, the work done (in litre atm) will be

The heat of combustion of sucrose, C₁₂ H₂₂ O₁₁ (s) at constant volume is 1348.9 kcal mol^-1 at 25°C, then the heat of reaction at constant pressure when steam is produced

The standard molar heat of formation of ethane, CO₂ and water (l) are respectively -21.1, - 94.1 and - 68.3 kcal. The standard molar heat of combustion of ethane will be

The ratio of heats liberated at 298 K from the combustion of one kg of coke and by burning water gas obtained from 1 kg of coke is (Assume coke to be 100% carbon). (Given : enthalpies of combustion of C, CO and H₂ as 393.5 kJ, 285 kJ, 285 kJ respectively all at 298 K)

On complete combustion, 0.246 g of an organic compound gave 0.198 g of CO₂ and 0.1014 g of H₂O. The ratio of carbon and hydrogen atoms in the compound

The standard enthalpies of formation of CO₂ (g), H₂O(l) and glucose (s) at 25°C are - 400 kJ / mol, -300 kJ / mol and -1300 kJ / mol, respectively. The standard enthalpy of combustion per gram of glucose at 25°C is

The enthalpy of combustion of C₆H₆ (l) is - 3250 kJ. When 0.39 g of benzene is burnt in excess of oxygen in an open vessel, the amount of heat liberated is