Question

Which of the following substances has the largest dispersion forces? a. H2 b. CCl4 cO2 Là d. Xe e.CH QUESTION 2 Consider the reaction: 4A + 2B - 6 C in which AHO = + 50.0 kj/mol. What is the AH for the following reaction? 30-2 A+ B 0.+ 25.0 kj/mol 5.- 25.0 kJ/mol 5.6.- 50.0 kJ/mol d.+ 50.0 kJ/mol
can u help me

Answer 1

Correct option: b

CCl₄ has the most number of electrons. Hence, it is most polarizable among all. Therefore, it has the largest dispersion force.

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Question 2:

Correct option: b

4A + 2B $\rightarrow$ 6C                          $\Delta H^{0} =$ + 50.0 kJ/mol

Enthalpy is a state function. Hence, reversing the equation to get,

6C $\rightarrow$ 4A + 2B                           $\Delta H^{0} =$ - 50.0 kJ/mol

Enthalpy is an extensive property. Hence, dividing the equation by 2 to get,

3C $\rightarrow$ 2A + B                             $\Delta H^{0} =$ - 25.0 kJ/mol