1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
wolverine [178]
3 years ago
9

Calculate the molar concentration of the polycyclic aromatic hydrocarbon (pah), anthracene (178.23 g/mol), that was found in a w

ell water sample at a concentration of 6.92 ppb. Assume the density of the water is 1.00 g/ml.
Chemistry
2 answers:
gladu [14]3 years ago
6 0

Explanation:

It is known that 1 ppb equals to 1 \mu g/L.

Therefore, 6.92 ppb is 6.92 \mu g in 1 liter of sample.

Hence, we will calculate the moles of Anthracene as follows.

           6.92 \mu g PHA \times \frac{1 mg PHA}{1000 \mu g PHA} \times \frac{1 g PHA}{1000 mg PHA} \times \frac{1 mol PHA}{178.23 g/mol}

          = 0.038 \times 10^{-6} mol PHA (Anthracene)

As we assume that volume of the solution is 1 L. So, calculate its molarity as follows.

              Molarity = \frac{\text{no. of moles}}{Volume}

                            = \frac{0.038 \times 10^{-6}}{1 L}

                           = 3.48 \times 10^{-8} M

Thus, we can conclude that molar concentration of the polycyclic aromatic hydrocarbon (PAH) is 3.48 \times 10^{-8} M.

tester [92]3 years ago
3 0

solution:

Calculate the molar concentration of the polycyclic aromatic hydrocarbon(PHA)(178.23g/mol),that was found in a well water sample at a concentration of 6.21ppb.Assume the density of the water is 1.00mg/mLppb corresponds to 1\mu g in 1L of sample \\the 6.21 ppb is 6.21\mu g in 1L of sample\\6.21\mu g PHA\times\frac{1mg PHA}{1000\mu g PHA}\times\frac{1g PHA}{1000\mu mg PHA}\times\frac{1mol. PHA}{178.23g PHA}\\3.48\times10^-8mol PHA\\and if we have 1L of solution\\m=\frac{moles}{v(L)}=\frac{3.48\times10^-8mol}{1L}\\3.348\times^10-8 M

You might be interested in
A gas occupies 200ml at a temperature of 26 degrees Celsius and 76mmHg pressure. Find the volume at -3degree Celsius with the pr
sergey [27]

Answer:

184.62 ml

Explanation:

Let p_1, v_1, and T_1 be the initial and p_2, v_2, and T_2 be the final pressure, volume, and temperature of the gas respectively.

Given that the pressure remains constant, so

p_1=p_2 ...(i)

v_1 = 200 ml

T_1= 26 ^{\circ}C = 273+26 =299 K

T_2= 3 ^{\circ}C = 273+3 =276 K

From the ideal gas equation, pv=mRT

Where p is the pressure, v is the volume, T is the temperature in Kelvin, m is the mass of air in kg, R is the specific gas constant.

For the initial condition,

p_1v_1=mRT_1 \\\\mR= \frac{p_1v_1}{T_1}\cdots(ii)

For the final condition,

p_2v_2=mRT_2 \\\\mR= \frac{p_2v_2}{T_2}\cdots(iii)

Equating equation (i), and (ii)

\frac{p_1v_1}{T_1}=\frac{p_2v_2}{T_2}

\frac{v_1}{T_1}=\frac{v_2}{T_2}  [from equation (i)]

v_2=\frac{T_2}{T_1} \times v_1

Putting all the given values, we have

v_2=\frac{276}{299} \times 200 = 184.62 \; ml

Hence, the volume of the gas at 3 degrees Celsius is 184.62 ml.

7 0
3 years ago
What is the most common isotope for element X
ankoles [38]

Answer:

isotope 2

Explanation:

it has the highest percentage abundance

5 0
3 years ago
What is the Nobel gas notation for selenium​
seraphim [82]

Answer:

Se =[Ar] 3d¹⁰ 4s² 4p⁴

Explanation:

The noble gas notation is used for the shortest electronic configuration of other periodic table elements.

For example:

The atomic number of Argon is 18, and its electronic configuration is,

Ar₁₈ = 1s² 2s² 2p⁶ 3s² 3p⁶

The atomic number of selenium is 34, its electronic configuration is,

Se₃₄ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴

By using the noble gas notation, electronic configuration of selenium can be written is shortest form.

Se =[Ar] 3d¹⁰ 4s² 4p⁴

This electronic configuration is also called abbreviated electronic configuration.

5 0
3 years ago
Determine how many mm of Hg are equal to 5.3 atm of pressure
Leno4ka [110]
4028 mm of Hg...........
5 0
3 years ago
Please can someone describe this picture? helppp
satela [25.4K]

Answer:

They are in a periodic table

5 0
3 years ago
Read 2 more answers
Other questions:
  • What is biological oxygen demand
    9·2 answers
  • Last question I think. . . <br><br><br> What would newtons third law be. . .<br><br> Help me!
    6·2 answers
  • Which type of bond will most likely be found in hbr?
    7·2 answers
  • When iron metal reacts with sulfuric acid, it produces iron (III) sulfate and hydrogen gas. Balance the equation: Fe + H2SO4 → F
    11·1 answer
  • 1. Which is not an example of a physical change to a wooden stick?
    12·1 answer
  • I have to do this for homework please help :)
    5·1 answer
  • Balance the equation <br><br> __Ni(CIO)3 → _NiCl2+ _02
    9·1 answer
  • How can we make use of acids or bases to remove metals from soils?
    14·1 answer
  • Type the max number of electrons that can be present in each shell or sub below
    9·2 answers
  • What are three ways of measuring the amount of substance?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!