If we recorded the mass before and after for the "other" chemical change experiments, they would appear to violate the law of conservation of mass. Each
experiment would show mass was "lost” during the chemical change. Explain
why.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

i believe the answer is three water molecules