Comparing the amount of water and salt molecules, which side of the membrane has the most concentrated salt solution? 

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;