Achemical reaction is carried out in a closed container. the energy absorbed by the chemical reaction is 50 kj. what is the energy liberated from the air or the walls of the container?

a)50 kj
b)75 kj
c)25 kj
d)100 kj

A) 50 kJ.

Explanation:

According to the law of conservation of energy that energy can not be destroyed or created from nothing but it can be converted from one form to another.In a closed system; the amount of heat released by a part of the system is equal to the amount of heat absorbed by other parts of the system.

Q released = Q absorbed.

So, the energy liberated from the air or the walls of the container is 50 kJ.

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.

The answer is c.  h+  and oh−  react to form water (h2o). i just took the test and i got it right. hope this !