Molecular systems tend to move spontaneously to a state of maximum randomness or disorder. molecular randomness, or disorder, is called entropy and is denoted by the symbol s. as a state function, entropy change, ? s, depends only on initial and final states. ? s has a positive value when disorder increases and a negative value when disorder decreases. the following conditions usually result in an increase in entropy:

a change of phase: solid? liquid? gas,

an increase in the number of gas molecules, or

a solid dissolving to form a solution.

although the sign of the entropy change can be predicted as described above, the actual value of ? s? must be calculated from the absolute entropy values, s? , of the reactants and products:

? s? =s? (products)? s? (reactants)

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest