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
Andre45 [30]
3 years ago
13

Calculate the molality of a solution that is prepared by mixing 25.5 ml of ch3oh (d = 0.792 g/ml and 387 ml of ch3ch2ch2oh (d =

0.811 g/ml.
Chemistry
2 answers:
Zanzabum3 years ago
8 0
The solvent is <span>ch3ch2ch2oh with a volume of 387 mL which is equivalent to
387 mL (0.811 g/mL) (1 kg /1000 kg) = 0.3139 kg
The moles of the alchol is
25.5 mL (0.792 g/mL) (1 mol/32 g) = 0.631 mol
The molality is
0.631 mol / 0.3139 kg = 2.01 mol/kg</span>
scoundrel [369]3 years ago
3 0

The molality of solution prepared by mixing 25.5 mL of {\text{C}}{{\text{H}}_{\text{3}}}{\text{OH}} and 387 mL of {\text{C}}{{\text{H}}_3}{\text{C}}{{\text{H}}_2}{\text{C}}{{\text{H}}_2}{\text{OH}} is \boxed{2.01{\text{ m}}}.

Further Explanation:

Different concentration terms are utilized in determining the concentration of various solutions. Some of the most commonly used terms are written below.

1. Molarity (M)

2. Mole fraction (X)

3. Molality (m)

4. Parts per million (ppm)

5. Mass percent ((w/w) %)

6. Volume percent ((v/v) %)

Molality is one of the concentration terms used very often in solutions. It is defined as moles of solute divided by the mass of solvent in kilograms. The formula to calculate molality of solution is as follows:

{\text{Molality of solution}} = \dfrac{{{\text{Moles }}\left( {{\text{mol}}} \right){\text{of solute}}}}{{{\text{Mass }}\left( {{\text{kg}}} \right){\text{ of solvent}}}}                                     …… (1)

The formula to calculate the density of component is as follows:

{\text{Density of component}} = \dfrac{{{\text{Mass of component}}}}{{{\text{Volume of component}}}}                                   …… (2)

Rearrange equation (2) to calculate mass of component.

{\text{Mass of component}} = \left( {{\text{Density of component}}} \right)\left( {{\text{Volume of component}}} \right)            …… (3)

Substitute 25.5 mL for volume of component and 0.792 g/mL for density of component in equation (3) to calculate mass of {\text{C}}{{\text{H}}_{\text{3}}}{\text{OH}}.

\begin{aligned}  {\text{Mass of C}}{{\text{H}}_{\text{3}}}{\text{OH}} &= \left( {{\text{0}}{\text{.792 g/mL}}} \right)\left( {{\text{25}}{\text{.5 mL}}} \right) \\   & = 20.196{\text{ g}} \\ \end{aligned}  

Substitute 387 mL for volume of component and 0.811 g/mL for density of component in equation (3) to calculate mass of {\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_2}{\text{C}}{{\text{H}}_2}{\text{OH}}.

\begin{aligned}  {\text{Mass of C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_2}{\text{C}}{{\text{H}}_2}{\text{OH}} &= \left( {{\text{0}}{\text{.811 g/mL}}} \right)\left( {{\text{387 mL}}} \right)\left( {\frac{{{{10}^{ - 3}}{\text{ kg}}}}{{1{\text{ g}}}}} \right) \\   & = 0.3139{\text{ kg}} \\ \end{aligned}  

The formula to calculate moles of {\text{C}}{{\text{H}}_{\text{3}}}{\text{OH}} is as follows:

{\text{Moles of C}}{{\text{H}}_{\text{3}}}{\text{OH}} = \dfrac{{{\text{Mass of C}}{{\text{H}}_{\text{3}}}{\text{OH}}}}{{{\text{Molar mass of C}}{{\text{H}}_{\text{3}}}{\text{OH}}}}                                                …… (4)

Substitute 20.196 g for mass of {\text{C}}{{\text{H}}_{\text{3}}}{\text{OH}}  and 32.04 g/mol for molar mass of   in equation (4).

\begin{aligned}  {\text{Moles of C}}{{\text{H}}_{\text{3}}}{\text{OH}} &= \frac{{{\text{20}}{\text{.196 g}}}}{{{\text{32}}{\text{.04 g/mol}}}} \\    &= 0.6303{\text{ mol}} \\ \end{aligned}  

Substitute 0.6303 mol for moles of solute and 0.3139 kg for mass of solvent in equation (1) to calculate molality of given solution.

\begin{aligned}  {\text{Molality of given solution}} &= \frac{{{\text{0}}{\text{.6303 mol}}}}{{{\text{0}}{\text{.3139 kg}}}} \\    &= 2.007{\text{ m}} \\   & \approx {\text{2}}{\text{.01 m}} \\ \end{aligned}  

Learn more:

  1. Calculation of volume of gas: brainly.com/question/3636135
  2. Determine how many moles of water produce: brainly.com/question/1405182

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: concentration, concentration terms, 2.01 m, molality, moles, mass, 0.3139 kg, CH3OH, CH3CH2CH2OH, 0.6303 mol.

You might be interested in
In chapter 51, Pip, Wemmick, and Jaggers discuss Estella's parentage. What does Jaggers advise Pip to do with this information?
Aleks04 [339]
What’s this story called
4 0
3 years ago
What tool do you use to measure a rectangle?
pashok25 [27]

Answer:

Ruler

Explanation:

3 0
2 years ago
Read 2 more answers
Which products are formed when aluminum is added to a silver chloride solution? Use the activity series below if needed. Al&gt;
kap26 [50]

Answer:

AlCl3 and Ag

Explanation:

Edge 2020

8 0
3 years ago
Read 2 more answers
Lewis structure for carbon tetrabromide (CBrÁ), in which a central carbon atom is bound to four atoms of the group 7A element br
nlexa [21]
Remember that carbon has 4 electrons in its valence shell meanwhile bromine has 7

So i think the lewis structure would be :

Br

C       Br      Br  

Br

Hope this helps

7 0
3 years ago
One atom of silicon can properly be combined in a compound with
Nina [5.8K]
<span>One atom of silicon can properly be combined in a compound with two atoms of oxygen.</span>
7 0
3 years ago
Read 2 more answers
Other questions:
  • Hen one atom contributes both bonding electrons in a single covalent bond, the bond is called a(n) ____.
    11·1 answer
  • Suppose we have a 12.2 L sample containing 0.50 mol oxygen gas at a pressure of 1 atm and a temperature of 25 degrees celcius. I
    10·1 answer
  • Arrange the elements in order of increasing atomic radius.Use the periodic table to help you
    8·1 answer
  • Why do people use symbols and numbers instead of equations in chemistry?
    14·1 answer
  • In which layer of earth do most earthauakes occur
    6·1 answer
  • The first eighteen chemical elements on the periodic table are described below in a series of statements. The first 1S letters o
    5·1 answer
  • In matrix form structure PVC stands for what?​
    12·1 answer
  • A family takes a summer vacation to Florida. They drive for 8 hours before stopping at a hotel for the night. They
    11·1 answer
  • Please help-- 15 pts!
    9·2 answers
  • HELP ASAP 20 OR MORE POINTS!!!!
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!