Select which of the following are used to determine the age of the Earth. Select 3.

The molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17x103L/mol/cm. Calculate the linear range of phenol conce

Scilla [17]

Explanation:

The given data is as follows.

$\lambda$ = 211 nm, $\sum = 6.17 \times 10^{3} mol/L/cm$

l = 1 cm, 7% < Transmittance < 85%

Suppose the aqueous solution follows Lambert-Beer's law. Therefore,

Absorbance = $-log \frac{\text{Percentage transmittance}}{100}$

Hence, for 7% transmittance the value of absorbance will be as follows.

Absorbance = $-log \frac{7}{100}$

$A_{1}$ = 1.155

For 85% transmittance the value of absorbance will be as follows.

Absorbance = $-log \frac{85}{100}$

$A_{2}$ = 0.07058

According to Lambert-Beer's law.

A = $\sum \times l \times C$

where, A = absorbance

$\sum$ = molar extinction coefficient

C = concentration

Therefore, concentration for 7% absorbance is as follows.

$A_{1} = \sum \times l \times C_{1}$

$C_{1}$ = $\frac{1.155}{6.17 \times 10^{3} \times 1}$

= $0.187 \times 10^{-3} mol/L$

= 0.187 mmol/L

Concentration for 85% absorbance is as follows.

$A_{2} = \sum \times l \times C_{2}$

$C_{2}$ = $\frac{0.07058}{6.17 \times 10^{3} \times 1}$

= $0.01144 \times 10^{-3} mol/L$

= 0.01144 mmol/L

Thus, we can conclude that linear range of phenol concentration is 0.01144 mmol/L to 0.187 mmol/L.

6 0

3 years ago

A rigid cylinder of gas shows a pressure of 600 torr at 215 K. It is moved to a new storage site where the pressure is now 750 t

Ronch [10]

PV=nRT

Here
P1/T1= P2 / T2
1 torr=133 pascal
600 *133 /215 = 750 *133 / t2
T2= 268.75 K

5 0

3 years ago

Part c

algol13

Distilling ocean water would be a good solution to meet this community's water needs because it will prevent some water borne diseases such as cholera, diarrhea, typhoid etc.

<h3>Importance of water distillation</h3>

Water Distillation Systems has several advantages and some of the advantages include;

It removes waterborne biological contaminants such as bacteria, viruses, organic and inorganic chemicals, heavy metals, etc
It makes the water fit for consumption

Thus, distilling ocean water would be a good solution to meet this community's water needs because it will prevent some water borne diseases such as cholera, diarrhea, typhoid etc.

Learn more about water distillation here: brainly.com/question/3166914

#SPJ1

6 0

2 years ago

Are plastic bags organic or inorganic?

Alborosie

Answer:

nilon is inorganic so they can be in the soil up to 5000 years

Explanation:

3 0

4 years ago

Read 2 more answers

To separate a mixture of iron filings and salt, the most efficient method would be

GaryK [48]

Answer:

Explanation:

Of course you could do the separation chemically. Dissolve the salt up in water, pass thru a filter, wash the iron filings with ethanol, which would encourage the salt to precipitate from solution.

I do hope I helped you! :)

4 0

3 years ago