When the reaction A rightarrow B reaches equilibrium, which quantity equals zero

Question

When the reaction A rightarrow B reaches equilibrium, which quantity equals zero? a. the concentrations of A and B b. The free energy change c. The equilibrium constant d. The enthalpy change A 25.0 g price of aluminum (sigma = 0.902 J/g degree C) is heated to 82.4 degree C and dropped into a calorimeter containing water (specifies heat capacity of water is 4.18 J/g degree C) initially at 22.3 degree C. The final temperature of the water is 24.6 degree C. Calculate the mass of water in the calorimeter. a. 119 g b. 6.57 g c. 3180 g d. 2130 g Calculate Delta Hrxn for the following reaction based on the given data: sO_2(g) rightarrow S(s) + O_2(g) 2SO_2(g) + O_2(g) rightarrow 2SO_3(g) S(s) + 3/2O_2(g) rightarrow SO_3(g) Delta H = -198.2 KJ Delta H = -395.2 KJ a. 296.1 KJ b. -296.1 KJ c. -592.2 KJ d. 592.2 KJ The normal boiling point of a substance is defined to be the temperature it which the liquid phase of the instance is in equilibrium with the gas phase at 1 atm pressure. The normal boiling point of methanol is 80 degree C and the Delta H_VIP is 38 kJ/mol. The Delta S)vap is a. -108 J/mol K b. 108 J/mol K c. -475 J/mol K d. 475 J/mol K A student made a plot for dissolving of in water (In K vs. I.T). He got a negative slop. This solution gets a. cold b. hot c. There is no change in T d. not enough information

Explanation / Answer

14) when a reaction approaches equilibrium the free energy change  (G) becomes less negative and when equilibrium reaches it finally becomes zero.

16) As mentioed in the question change in enthalpy( H) is positive i.e.- the reaction is endothermic, which means that heat is absorbed during the reaction. AS a result of which energy of product become smore than that of the reactants. Thus temperature of the surrounding increases

Hence the statement which is not true is, statement 'd'

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