Question 1. If the process is carried out at constant volume , ΔV=0 . The enthalpy change $(\Delta H)$ for the reaction: $N_{2}(g)+3 H_{2}(g) \rightarrow 2 N H_{3}(g)$, $\Delta H-92.38 k J=-92380 J, R=8.314 J K^{-1} \mathrm{mol}^{-1}$, $-92380=\Delta U-2 \times 8.314 \times 298$, $\Delta U=-92380+4955=-87425 J=-87.425 k J$, For the water gas reaction $\left.\mathrm{Q}_{5} \text { ) }+\mathrm{H}_{2} \mathrm{Q}(g) \rightleftharpoons \mathrm{C} Q_{g}\right)+\mathrm{H}_{2}(\mathrm{g})$. What is meant by average bond enthalpy ? To help the students to prepare for examination more effectively, we provide CBSE marks wise questions for Class 11 are given here. Answer: Question 22. Candidates who are ambitious to qualify the Class 11 with good score can check this article for Notes. Thermodynamics Chemistry Chapter 6 • Important Terms and Definitions System: Refers to the portion of universe which is under observation. The best app for CBSE students now provides Thermodynamics class 11 Notes Chemistry latest chapter wise notes for quick preparation of CBSE exams and school based annual examinations. Molar heat capacity of $L i(s)=3.57 \times 7=25.01 J \mathrm{mol}^{-1} K^{-1}$, Molar heat capacity of $N a(s)=1.23 \times 23=28.3 \mathrm{J} \mathrm{mol}^{-1} \mathrm{K}^{-1}$, Molar heat capacity of $K(s)=0.756 \times 39=29.5 \mathrm{J} \mathrm{mol}^{-1} \mathrm{K}^{-1}$, Molar heat capacity of $R b(s)=0.363 \times 85=30.88 J \mathrm{mol}^{-1} \mathrm{K}^{-1}$, Molar heat capacity of $C s(s)=0.242 \times 133=32.2 \mathrm{J} \mathrm{mol}^{-1}$, The trend is that there is continuous increase of molar heat capacity with increase in atomic mass. The enthalpy of vaporisation of liquid diethyl ether $\left[\left(C_{2} H_{5}\right)_{2} O\right]$ is $26.0 \mathrm{kJ} \mathrm{mol}^{-1}$ at its boiling point $\left(35^{\circ} \mathrm{C}\right)$. thermodynamic state function and apply it for spontaneity; • explain Gibbs energy change (∆G); and • establish relationship between ∆G and spontaneity, ∆G and equilibrium constant. Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI. Assertion (A) : Spontaneous process is an irreversible process and may be reversed by some external agency. Enter OTP. Expansion of a gas in vacuum is called free expansion. Oswaal Chemistry Chapter 2 Short Answer Type Questions I Solutions Class 11 is a complete exam preparation tool. The temperature of calorimeter rises from $294.05 K$ to $300.78 K .$ If the heat capacity of calorimeter is $8.93 \mathrm{kJK}^{-1}$, calculate the heat transferred to the calorimeter. On the basis of thermochemical equations (a), (b) and (c), find out which of the algebric relationships given in options (i) to (iv) is correct. For $\Delta G$ to be negative, $T \Delta S$ must be $>\Delta H$. Khan Academy is a 501(c)(3) nonprofit organization. info@entrancei.com. Standard enthalpy of vapourisation D vap H Q for water at 100° C is 40.66 kJmol –1.The internal energy of vapourisation of water at 100°C (in kJmol –1) is (Assume water vapour to behave like an ideal gas) [CBSE AIPMT 2012] q v = ΔU. Register online for Chemistry tuition on Vedantu.com to score more marks in your examination. $\therefore$ The enthalpy of polymerization $\left(\Delta H_{\text {poly }}\right)$ must be negative. }=\frac{\Delta H_{v a p . Given that the enthalpy of vapourisation of carbon monoxide is $6.04 \mathrm{kJ} \mathrm{mol}^{-1}$ at its boiling point of $82.0 K$, $\Rightarrow \Delta H$ during vapourisation of $28 g=6.04 \mathrm{kJ}$, $\Delta H$ during vapourisation of $2.38 g \mathrm{CO}=\frac{6.04}{28} \times 2.38$, Thus, enthalpy change $=513.4 \mathrm{J}$, In the reaction $C_{3} H_{8}(g)+5 O_{2} \rightarrow 3 C O_{2}+4 H_{2} O(g) \quad$ if, standard enthalpy change $\Delta H_{r}^{\circ}=-2.05 \times 10^{3} k J / m o l_{r x n}$ and bond energies of $C-C, C-H, C=O$ and $O-H$ are 347 $414,741$ and 464 respectively calculate the energy of oxygen. (i) At what temperature the reaction will occur spontaneously from left to right? You can see some Detailed Chapter Notes - Thermodynamics, Class 11, Chemistry | EduRev Notes sample questions with examples at the bottom of this page. 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