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
klio [65]
3 years ago
9

Determine the boiling point of a solution that contains 70.6 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 72

2 mL of benzene (d = 0.877 g/mL). Pure benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C/m.
Chemistry
1 answer:
MissTica3 years ago
3 0

Answer:

Boiling point of the solution is 82.3°C

Explanation:

Boiling point elevation is defined as the increasing of a boiling point of a substance by the addition of a solute. The formula is:

ΔT = K×m×i

<em>Where ΔT is change in temperature (Final T - 80.1°C), K is boiling point elevation constant (2.53°C/m), m is molality of the solution (moles of naphthalene / kg of benzene) and i is Van't Hoff factor (1 for Naphthalene)</em>

Moles of 70.6g of naphthalene are:

70.6g × (1mol / 128.16g) = 0.5509 moles

Kg of 722mL of benzene are:

722mL × (0.877g / mL) × (1kg / 1000g) = 0.633kg of benzene

Replacing in boiling point elevation formula:

(T - 80.1°C) = 2.53°C/m×(0.5509mol / 0.633kg)×1

T - 80.1°C = 2.2°C

T = 80.1°C + 2.2°C

T = 82.3°C

<h3>Boiling point of the solution is 82.3°C</h3>
You might be interested in
A certain compound is made up of one phosphorus (P) atom, three chlorine (Cl) atoms, and one oxygen (O) atom. What is the chemic
user100 [1]
<span> POCl3 is the correct way to write the chemical formula for this compound</span>
5 0
3 years ago
DISCUSSION QUESTION
andrey2020 [161]
No, I don’t think so. My reason being that some of these viruses are not harmful, an example is bacteriophage which kills bacteria.
6 0
3 years ago
The pH of a solution is 2.0. Which statement is correct? Useful formulas include , , , and .
allsm [11]

Answer:

if the pH of a solution is 2.0 that means the solution would be acidic.

Explanation:

3 0
3 years ago
In the reaction: CH3COO-+NH4+----------CH3COOH+NH3 what is the reactant acid and its conjugate base?
WINSTONCH [101]

Answer : The reactant acid and conjugate base in this reaction is, NH_4^ and NH_3.

Explanation :

Conjugate acid : A species that is formed by receiving of a proton (H^+) by a base is known as conjugate acid.

Conjugate base : A species that is formed by donating of a proton by an acid is known as conjugate base.

The given chemical reaction is,

CH_3COO^-+NH_4^+\rightleftharpoons CH_3COOH+NH_3

In this reaction, CH_3COO^-(base) react with NH_4^(acid) to give CH_3COOH(conjugate acid) and NH_3(conjugate base).

Therefore, the reactant acid and conjugate base in this reaction is, NH_4^ and NH_3.

8 0
3 years ago
Which of the following is NOT true of a chemical change?
DaniilM [7]
C. the substance only changed form or appearance

the substance changes at a chemical level, not just in appearance
7 0
3 years ago
Other questions:
  • BRAINLIESTTT ASAP!!! PLEASE ANSWER!
    6·2 answers
  • Which is greater in positive acceleration, initial or final velocity
    14·1 answer
  • What element in the second period has the largest atomic radius?
    6·1 answer
  • Calculate the mass (in kg) of water produced from the combustion of 1.0 gallon (3.8 L) of gasoline (C8H18). The density of gasol
    11·2 answers
  • What happens to the density of most substances as they cool and solidify?
    5·1 answer
  • What is the difference between an atom in the ground state and an atom in an excited state? A. The atom in the ground state has
    11·2 answers
  • 2.3*10^14 and 5.4*10^-3
    8·1 answer
  • What is (3 X 10^3) +(2.5 X 10^6)? *
    11·2 answers
  • Which option identifies all the bonds broken during this chemical reaction?
    12·2 answers
  • 26. At high temperatures these elements conduct electricity but at lower temperatures they do not conduct electricity. This make
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!