Use the diagram below to answer the next two questions representing the reaction

Question

Use the diagram below to answer the next two questions representing the reaction: A + B rightarrow C + D What is the value of the activation energy for the reaction: C + D rightarrow A + B 25 kJ 55 kJ 85 kJ -30 kJ What is the enthalpy; delta H, for the original reaction? 25 kJ -25 kJ -55 kJ 55 kJ The normal boiling point and vapor pressure at 25 degree C are measured for liquids in two flasks. Flask A contains pure water and flask B contains a 1.0 M NaCl aqueous solution. Which flask contains the liquid with the higher boiling point and which flask contains the liquid with higher vapor pressure? Iodine-131 is frequently used to treat thyroid cancer or tumors. I-131 has a half-life of 8.02 days making it ideal for cancer treatment. How long will it take for 80 % of a sample given to a patient to decay? 32 days 13 days 19 days 2.6 days Acetone, (CH_3)_2C = O and chloroform, CHCl_3 form a homogeneous solution, give the major force of attraction between them. dipole-dipole dispersion hydrogen bonding ion-ion ion-dipole

Explanation / Answer

17.activation energy = energy difference between transition state & initial energy of reactants

= 90-35

=55kJ

So option b was correct.

18.enthalphy change = energy of products - energy of reactants

= 60-35

= 25 kJ

So option a was correct

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