What substances dissolve in water?

Nitrogen dioxide is one of the many oxides of nitrogen (often collectively called "NOx") that are of interest to atmospheric che

Lesechka [4]

Answer:

The moles of dinitrogen tetroxide after equilibrium is reached the second time is 18.78 moles.

Explanation:

$2NO_2\rightleftharpoons N_2O_4$

Initially 35.0 mol

Eq'm 8.0 mol 13.5 mol

Moles of nitrogen dioxide = 35.0 mol

Moles of nitrogen dioxide at equilibrium = 8.0 mol

According to reaction, 2 moles nitrogen oxide gives 1 mol of dinitrogen tetraoxide. Then 27 mol of nitrogen dioxde will give:

$\frac{1}{2}\times 27 mol=13.5 mol$

Moles of dinitrogen tetroxide = 13.5 mol

Concentration of nitrogen dioxide at equilibrium, $[NO_2] =\frac{8.0 mol}{125.0 L}$

Concentration of dinitrogen tetradioxide at equilibrium, $[N_2O_4] =\frac{13.5 mol}{125.0 L}$

Equilibrium constant of reaction:

$K_c=\frac{[N_2O_4]}{[NO_2]^2}$

$K_c=\frac{\frac{13.5 mol}{125.0 L}}{(\frac{8.0 mol}{125.0 L})^2}=26.37$

Now, adds another 12.0 moles of nitrogen dioxide.

$2NO_2\rightleftharpoons N_2O_4$

Initially 35.0 mol

Eq'm 8.0 mol 13.5 mol

After adding 12 moles of nitrogen dioxide the moles

(8.0 mol+12 mol)

Again after attaining equilibrium second time:

(20.0 -x)mol (13.5+x/2) mol

Concentration of nitrogen dioxide at second equilibrium, $[NO_2] =\frac{(20.0 -x)mol}{125.0 L}$

Concentration of dinitrogen tetradioxide at second equilibrium, $[N_2O_4] =\frac{(13.5 +x/2)mol}{125.0 L}$

$K_c=\frac{\frac{(13.5+x/2)}{125 L}}{(\frac{(20.0 mol -x)}{125 L})^2}$

$26.37=\frac{(13.5+x/2)\times 125}{(20.0-x)^2}$

on solving for x:

we get x = 10.56

Moles of dinitrogen tetroxide after equilibrium is reached the second time:

$(13.5 + \frac{x}{2})mol = 13.5 + (\frac{10.56}{2}) mol= 18.78 mol$

3 0

3 years ago

A distillation column with a partial reboiler and a total condenser is being used to separate a mixture of benzene, toluene, and

ololo11 [35]

Answer:

11.8.4 Distillation Columns

Distillation columns present a hazard in that they contain large inventories of flammable boiling liquid, usually under pressure. There are a number of situations which may lead to loss of containment of this liquid.

The conditions of operation of the equipment associated with the distillation column, particularly the reboiler and bottoms pump, are severe, so that failure is more probable.

The reduction of hazard in distillation columns by the limitation of inventory has been discussed above. A distillation column has a large input of heat at the reboiler and a large output at the condenser. If cooling at the condenser is lost, the column may suffer overpressure. It is necessary to protect against this by higher pressure design, relief valves, or HIPS. On the other hand, loss of steam at the reboiler can cause underpressure in the column. On columns operating at or near atmospheric pressure, full vacuum design, vacuum breakers, or inert gas injection is needed for protection. Deposition of flammable materials on packing surfaces has led to many fires on opening of distillation column for maintenance.

Another hazard is overpressure due to heat radiation from fire. Again pressure relief devices are required to provide protection.

The protection of distillation columns is one of the topics treated in detail in codes for pressure relief such as APIRP 521. Likewise, it is one of the principal applications of trip systems.

Another quite different hazard in a distillation column is the ingress of water. The rapid expansion of the water as it flashes to steam can create very damaging overpressures.

8 0

2 years ago

Provide an explanation for each of the following strange facts about Mercury:

frozen [14]

Answer:

Explanation:

1. Mercury’s atmosphere is incredibly thin.

It's thin because the atmosphere is made up of atoms blasted off its surface by the Solar wind and also consist of the stream particles coming from the outer layer of the sun

2. The length of a mercury year is about 1.5 times longer than a mercury a day.

Mercury revolves around the sun very quickly but rotates around its axis very very slowly

3.The temperature range on Mercury is about 590 °C.

During the day, temperatures on Mercury's surface can reach Very High But, the planet has no atmosphere to retain that heat

8 0

3 years ago

Help me pleaseeeeeeee

xxMikexx [17]

Answer:

1. c.

2. d.

3. d.

4. a.

5. a.

6 0

3 years ago

One molecule of caffeine contains 8 atoms of carbon, 10 atoms of hydrogen, 2 atoms of oxygen, 4 atoms of nitrogen. write the for

Gekata [30.6K]

Formula of caffeine: C8H10O2N4

8 0

4 years ago

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