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according to the gibbs free energy equation, triangle G = triangle H - triangle T triangle S, when could a high temperature make a reaction that was non spontaneous at low temperature spontaneous
a. when triangle H and triangle S are both positive
b. when triangle H is positive and triangle S is negative
c. when triangle H and triangle S are both negative
d. when triangle H is negative and triangle S is positive

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

Floor 19 is an isotope of fluorine it has different number a. electrons b. protons c. neutrons d.electron shells

1. list the number of drops of titrant needed to produce a color change for sample a and sample b. list the actual volume of titrant needed to produce a color change for sample a and sample b.