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
STatiana [176]
3 years ago
11

A student dissolves 3.9g of aniline (C6H5NH2) in 200.mL of a solvent with a density of 1.05 g/mL . The student notices that the

volume of the solvent does not change when the aniline dissolves in it.
Calculate the molarity and molality of the student's solution. Be sure each of your answer entries has the correct number of significant digits.

How do I enter a number in scientific notation?

a. molarity =
b. molality =
Chemistry
1 answer:
Tresset [83]3 years ago
7 0

Answer:

a. Molarity= M =2.1x10^{-1}M

b. Molality= m=2.0x10^{-1}m

Explanation:

Hello,

In this case, given the information about the aniline, whose molar mass is 93g/mol, one could assume the volume of the solution is just 200 mL (0.200 L) as no volume change is observed when mixing, therefore, the molarity results:

M=\frac{n_{solute}}{V_{solution}} =\frac{3.9g*\frac{1mol}{93g} }{0.2L} =2.1x10^{-1}M

Moreover, the molality:

m=\frac{n_{solute}}{m_{solvent}} =\frac{3.9g*\frac{1mol}{93g} }{0.2L*\frac{1.05kg}{1L} } =2.0x10^{-1}m

Best regards.

You might be interested in
Tetrachloromethane, CCl4 is produced from the substitution reaction between methane and chlorine gas. If the rate of formation o
Korolek [52]

The rate of disappearance of chlorine gas : 0.2 mol/dm³

<h3>Further explanation</h3>

The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.

For reaction :

\tt aA+bB\rightarrow cC+dD

The rate reaction :

\tt -\dfrac{1}{a}\dfrac{d[-A]}{dt}= -\dfrac{1}{b}\dfrac{d[-B]}{dt}=\dfrac{1}{c}\dfrac{d[C]}{dt}=\dfrac{1}{d}\dfrac{d[D]}{dt}

Reaction for formation CCl₄ :

<em>CH₄+4Cl₂⇒CCl₄+4HCl</em>

<em />

From equation, rate of reaction = rate of formation CCl₄ = 0.05 mol/dm³

Rate of formation of  CCl₄  = reaction rate x coefficient of  CCCl₄

0.05 mol/dm³ = reaction rate x 1⇒reaction rate = 0.05 mol/dm³

The rate of disappearance of chlorine gas (Cl₂) :

Rate of disappearance of  Cl₂  = reaction rate x coefficient of  Cl₂

Rate of disappearance of  Cl₂ = 0.05 x 4 = 0.2 mol/dm³

4 0
3 years ago
How does convection affect the earths atmosphere
mel-nik [20]

Answer:

I think the layers of the atmosphere does temperature increase with increasing height. It is affected by convection because it heats the lower atmosphere. It is affected by conduction because the is the transfer of thermal energy. I guess

Hope this help!

3 0
2 years ago
Which of these is a pure substance
Galina-37 [17]

Both A and B are the answer.


4 0
3 years ago
Question Ask “ Which Part Of The Ecological Pyramid Is Incorrect.”
shepuryov [24]
Primary producers i believe
4 0
3 years ago
Read 2 more answers
A chemical reaction resulting in the transfer of electrons or hydrogen atoms from one molecule to another is called a(n) _______
anzhelika [568]

The kind of reaction involving the transfer of electrons or hydrogen away from a molecule is called oxidation.

In the same vein, the molecule that receives the electron or the hydrogen atom is said to be reduced. This means that oxidation cannot exist in isolation without reduction.

In other words, oxidation is defined as:

  • Loss of electrons
  • Loss of hydrogen atoms
  • Gain of oxygen atoms
  • Gain in oxidation number

While reduction is defined as:

  • Gain of electrons
  • Gain of hydrogen atom
  • Loss of oxygen atom
  • Reduction in oxidation number

More on oxidation/reduction reactions can be found here: brainly.com/question/3867774

7 0
2 years ago
Read 2 more answers
Other questions:
  • If acid gets on your skin or clothes, wash at once with?
    6·1 answer
  • What is the contrast of these two atoms?
    5·1 answer
  • Convert 1.248×1010 g to each of the following units.
    9·1 answer
  • What ending is given for a compound that contains two elements and oxygen?
    11·2 answers
  • What happens in a decomposition reaction​
    8·2 answers
  • Are particles in gas close together ​
    13·1 answer
  • What factors affect the radius of an atom?
    6·1 answer
  • How many grams of H2 are needed to completely react within 50g of N2?
    9·1 answer
  • !!Please Help!!
    11·2 answers
  • 30 treadmills to 36 elliptical machines
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!