Water standing in the open at 29.2°c evaporates because of the escape of some of the surface molecules. the heat of vaporization (548 cal/g) is approximately equal to εn, where ε is the average energy of the escaping molecules and n is the number of molecules per gram.
(a) find ε.
(b) what is the ratio of ε to the average kinetic energy of h2o molecules, assuming the latter is related to temperature in the same way as it is for gases?

a) ε = 6.86x J

b) ε/Kavg = 10.98

Explanation:

a) The heat of evaporation (Lv) is

Lv = εn

ε = Lv/n

n is the number of molecules in a gram of the substance. The molar mass of water (H2O) is 2x1 g of H + 16 g of O = 18 g/mol.

By the Avogadros' number(NA), we know that 1 mol = 6.02x molecules, so n will be:

n = NA/ molar mass

n =

n = 3.34x molecules/g

So,

ε =

ε = 1.64x cal

As 1 cal = 4.18 J, ε = 6.86x J

b) For ideal gases, the average of the kinetic energy (the internal energy of the molecules) is given by :

Kavg = kT

Where Kavg is the average of the kinetic energy, k is the Boltzmann's constant and T is the temperature in Kelvin.

Knowing that k = 1.38x J/K and T = 29.2ºC + 273 = 302.2 K

Kavg = x1.38xx302.2

Kavg = 6.25x J

So the ratio of ε to the average kinetic energy of H2O molecules is

ε/Kavg =

ε/Kavg = 10.98

when—without warning—something provokes your anger, you may struggle not to succumb to it. since what typically makes you mad is feeling powerless in the face of what seems unfair, your anger is mostly an attempt at a “quick fix” to right the balance. it’s as though you’re raising a fist in protest, proclaiming that you’re not going to capitulate to such injustice.

there are, however, a multitude of problems related to this immediate, push-back reaction of anger. and probably the key one is that almost never does it resolve the issue that gave rise to it. such reactive anger is probably best understood as self-defeating. as david burns, the author of the seminal self- book feeling good, observes: if realistically, acting on your anger is to make any sense, it needs to meet two criteria—which, in almost every case, is frankly impossible. that is, your anger must:

be directed toward a person who has intentionally (and needlessly) behaved in a hurtful way toward you; and

be beneficial or advantageous to you (i.e., assist you in achieving a desired goal).

i think you’ll agree that only rarely can you claim that your anger is both warranted and , whether to yourself or the relationship.

so let me offer you a two-step alternative to abandoning your better judgment and giving in to the temptation of anger—one that should neutralize your anger in seconds. or, when you’re really angry, in minutes.

but keep in mind that you must really want to execute these steps, be sufficiently motivated to perform them. which means overcoming more unconscious resistance than you might ever have imagined. because there are many immediate “advantages” of anger that can interfere with your resolve, i’ll suggest a few of them that might interfere with your employing this powerful method to rid yourself of counter-productive anger.

explanation:

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.