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The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity Revision for JEE

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  1. 1.Core idea: The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity
  2. 2.Relates to other subtopics in Chemical Thermodynamics
  3. 3.First law, enthalpy, Hess's law
  4. 4.Entropy and Gibbs energy
  5. 5.Master The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity definitions and standard results
  6. 6.Solve 20 timed MCQs for The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity

Syllabus context

Part of Chemical Thermodynamics in JEE Main Chemistry.

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Q1ChemistryUnit 4: Chemical Thermodynamics
Which of the following statement(s) is/are true? "Internal energy of an ideal gas
Q2ChemistryUnit 4: Chemical Thermodynamics
When 229 J of energy is supplied as heat at constant pressure to 3 mol Ar(g),A r(g), the temperature of the sample is increased by 2.55K2.55 \mathrm{K}. Calculate the motor heat capacity at constant volume:
Q3ChemistryUnit 4: Chemical Thermodynamics
An ideal gas is compressed in a closed container its U?
Q4ChemistryUnit 4: Chemical Thermodynamics
Root mean square velocity of molecules of a diatomic gas is to be increased to 1.5 times, If the process is done adiabtically, the ratio of initial volume to the final volumes is :
Q5ChemistryUnit 4: Chemical Thermodynamics
Under which of the following conditions is the relation, △H=△U+P△V\triangle \boldsymbol{H}=\triangle \boldsymbol{U}+\boldsymbol{P} \triangle \boldsymbol{V} valid for a closed system?
Q6ChemistryUnit 4: Chemical Thermodynamics
The molar enthalpy change for H2O(l)⇌H2O(g)\boldsymbol{H}_{2} \boldsymbol{O}(l) \rightleftharpoons \boldsymbol{H}_{2} \boldsymbol{O}(\boldsymbol{g}) at 373K\boldsymbol{3} \boldsymbol{7} \boldsymbol{3} K and 1\boldsymbol{1} at m\boldsymbol{m} is 41kJ/41 k J / mol. Assuming ideal behavior the internal energy change for vaporization of 1 mol of water at 373K373 K and 1 atm in kJmol−1\mathrm{kJ} \mathrm{mol}^{-1} is:
Q7ChemistryUnit 4: Chemical Thermodynamics
Calculate the temperature of a hydrogen-oxygen flame assuming that the gases at 25∘C25^{\circ} \mathrm{C} are mixed in stoichiometric proportion and react completely to give H2O(g).ΔH298∘H_{2} O(g) . \Delta H_{298}^{\circ} of combustion of H2\boldsymbol{H}_{2} is −58-\mathbf{5 8} kcal mol−1\boldsymbol{m o l}^{-1} The reaction is at constant pressure and the CpC_{p} values are (7/2)R(7 / 2) R for each gas. (R=2cal)(\boldsymbol{R}=\mathbf{2} \boldsymbol{c} \boldsymbol{a} \boldsymbol{l})
Q8ChemistryUnit 4: Chemical Thermodynamics
Assertion CP−CV=RC_{P}-C_{V}=R for an ideal gas. Reason [∂E∂V]T=0\left[\frac{\partial E}{\partial V}\right]_{T}=0 for an ideal gas.

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