MEDIUM
JEE Main
IMPORTANT
Earn 100

A fish swimming in water body when taken out from the water body is covered with a film of water of weight 36 g. When it is subjected to cooking at 100 °C, then the internal energy for vaporization in kJmol-1 is integer]

[Assume steam to be an ideal gas. Given ΔvapH for water at 373 K and 1 bar is 41.1 kJ mol-1:R=8.31 J K-1 mol-1]

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Important Questions on Thermodynamics

HARD
JEE Main
IMPORTANT

40% of HI undergoes decomposition to H2 and I2 at 300 K.ΔGΘ for this decompostion reaction at one atmopsphere pressure is____Jmol-1-[nearest integer]

Use R=8.31JK-1 mol-1;log2=0.3010,ln10=2.3,log3=0.477

HARD
JEE Main
IMPORTANT

For complete combustion of methanol

CH3OHl+32O2gCO2g+2H2Ol the amount of heat produced as measured by bomb calorimeter is 726 kJ mol-1 at 27 °C. The enthalpy of combustion for the reaction is -x kJ mol-1, where x is
integer)
(Given : R=8.3JK-1 mol-1)

MEDIUM
JEE Main
IMPORTANT

Match List - I with List - II.

  List-I   List-II
A Spontaneous process I ΔH<0
B Process with ΔP=0,ΔT=0 II ΔGT,P<0
C ΔHreaction III Isothermal and isobaric process
D Exothermic Process IV [Bond energies of molecules in reactants] -
[Bond energies of product molecules]

Choose the correct answer from the options given below

MEDIUM
JEE Main
IMPORTANT
When 5 moles of He gas expand isothermally and reversibly at 300 K from 10 litres to 20 litres, the magnitude of the maximum work obtained in J is . [nearest integer ] (Given : R=8.3 J K-1 mol-1 and log2=0.3010)
MEDIUM
JEE Main
IMPORTANT
4.0 L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is 20 L. The amount of heat absorbed in this expansion is ____L atm.
HARD
JEE Main
IMPORTANT
For combustion of one mole of magnesium in an open container at 300 K and 1 bar pressure, ΔCH=-601.70 kJ mol-1, the magnitude of change in internal energy for the reaction is kJ. (Nearest integer)
(Given : R=8.3 J K-1 mol-1)
EASY
JEE Main
IMPORTANT
17.0 g of NH3 completely vapourises at -33.42 °C and 1 bar pressure and the enthalpy change in the process is 23.4 kJ mol-1. The enthalpy change for the vapourisation of 85 g of NH3 under the same conditions is kJ.
MEDIUM
JEE Main
IMPORTANT

2.2 g of nitrous oxide N2O gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217.1 mL to 167.75 mL. The change in internal energy of the process, U is '-x'J. The value of 'x' is _____.

[nearest integer]

(Given: atomic mass of N=14 g mol-1 and of O=16 g mol-1. Molar heat capacity of N2O is 100 JK-1 mol-1)