Question

To answer Questions 4.1-4.4, you will need the thermodynamic data pertaining to the hypothetical element "J" below. JEJ BOND BOND ENERGY BOND LENGTH J-J 350 kJ/mol 160 pm J=J 600 kJ/mol 830 kJ/mol 94 pm 68 pm 4.1. A single bond is held together by 2 electrons, while a triple bond is held together by 6 electrons. Which seems to be more important when comparin a triple bond to a single bond: increased electron-electron repulsion or increased electron-proton attraction? Use data from the table to support your answer. 4.2. Using only the bond energies given in the table, calculate AHrxn for the reaction shown below. Express your answer in kJ/mol Jo rounded to the nearest whole number and be sure to indicate whether you answer is positive or negative. --0-0 3 x JEJ -

Answer 1

Answers-

4.1 As per the given data triple bond's bond length decreases it indicate both the atoms come closer, which means electron proton attraction increases.

4.2
4.2 4.2 Altan Alex = [ 3+ (1+) + 3 x( 5:1) - [3 x (J=1)] - L(3x600) + 3 (350) ] - [ 3x 830) 1800 + 1050 - 2490 = 2850 - 2490 = 360 RI Imol DHgin = OHO BOND BROKEN CREACTANTS) AH ROND FORMED C PRODUCTS) = [ 3x(JEJ)] - [ 3 (JPJ) + 3 (5-1)] = [ 3x 830) - [ 63x600) + 3(350)] = 2490 - 2850 = -360 kJ/mol

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4.3 In the structure of the product due to resonance all the bonds become equivalent so all of them will have same energy

Therefore the bond strength between J​​​​​​b and J​​​​​​c = 475 KJ/mol.

4.4 Due to resonance the bond length of pure double bond increases and that of pure single bond decreases.

So the bond length between J​​​​​​b and J​​​​​​c greater than 94 pm.

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