Suppose a reaction is known to be and exoticism under standard conditions at 25

Question

Suppose a reaction is known to be and exoticism under standard conditions at 25 degree C. Which of the following MUST be true? (Assume Delta H degree and Delta S degree are not functions of temperature) a. The entropy of the system will increase under standard conditions at 25 degree C. b. Delta G will be negative at 25 degree C, regardless of the concentration as of reactants and products. c. The reactor will be under standard conditions at 30 degree C. d. The reaction will be under standard conditions at 300 degree C. What is the minimum amount of work required to move a mole of K ions up a concentration gradient from 100 mM to 30 mM at 57 degree C? a. 3.3 kJ b. 0.57 kJ c. 3.3 kJ d. -0.57 kJ Using the data provided estimate Delta H degree for this chemical a. -42.9 kJ/mol b. 42.9 kJ.mol c. 32.9 kJ/mol d. -32.9 kJ/mol For question 23-26 consider that phosphorous trichloride is an important industrial chemical used for the manufacture of organophosphorous compounds such as pesticides and surfactants. It is highly toxic and can be lethal upon ingestion phosphorous tetrachloride is produced by the reaction of white can be lethal upon ingestion phosphorous trichloride is produced by the reaction of white phosphorous with chlorine gas to yield liquid PCI3 at 298K: 2f(s) + 3CI_2(g) rightarrow 4PCI_3(g) What is the vapor pressure of PCI_3 at 298 K? a. 0.16 b. 6.05 c. 0.998 d. 4.7 What is the vapor pressure of PCI3 at 400 K? a. 0.16 atm b. 4.7 atm c. 6.05 atm d. 0.21 atm

Explanation / Answer

26. Answer: option b.

The ultimate criteria for a reaction to be spontaneous under given conditions is that change in free energy i.e Gibbs energy should be negative.

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