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Earn 100

The enthalpy change (ΔH) for the reaction. N2( g)+3H2 g)2NH3( g) is -92.38 kJ at 298 K. The internal energy change ΔU at 298 K is: 

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Important Questions on Thermodynamics

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Assertion: Water in liquid state is more stable than ice at room temperature.

Reason: Water in liquid form has higher entropy than ice.

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Assertion: For the combustion of methane, ΔE>ΔH Reason: ΔH is related by E by the expression. ΔH=ΔE+ΔnRT 
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For a reaction to be spontaneous at all temperatures
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Assertion: For a reaction 2NH3(g)N2(g)+3H2(g):  ΔH>ΔE 

Reason: Enthalpy change is always greater than internal energy change.

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Enthalpy of combustion of methane and ethane are -210 k cal/mol and -368 k cal/mol respectively. The enthalpy of combustion of decane is
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Assertion: The heat adsorbed during isothermal expansion of an ideal gas against vacuum is zero. Reason: The volume occupied by the molecule is zero.
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The enthalpy of formation of CO (g), CO2 (g), N2O (g) and N2O4 (g) -110,-393,+811 and 10 kJ/mol, respectively. For the reaction, N2O4 (g)+3CO (g)N2O (g)+3CO2 (g), ΔHf(kJ/mol) is: 
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For adiabatic process, which is correct?