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
Natasha_Volkova [10]
3 years ago
8

Two beakers are placed in a closed container. Beaker A initially contains 0.15 mole of naphthalene (C10H8) in 100 g of benzene (

C6H6), and beaker B initially contains 31 g of an unknown compound dissolved in 100 g of benzene. At equilibrium, beaker A is found to have lost 7.0 g of benzene. Assuming ideal behavior, calculate the molar mass of the unknown compound. State any assumptions made.
Chemistry
1 answer:
GalinKa [24]3 years ago
3 0

Answer:

Molar mass of the unknown compound is 192.2 g/mol

Explanation:

Assumption:

At equilibrium, molality of beaker A = molality of beaker B

Molality of beaker A = moles of naphthalene/kg of benzene

Mass of benzene = 100 - 7 = 93 g = 93/1000 = 0.093 kg

Molality of beaker A = 0.15/0.093 = 1.613 m

Molality of beaker B = moles of unknown compound (y)/kg of benzene

Mass of benzene = 100 g = 100/1000 = 0.1 kg

Molality of beaker B = (y/0.1) m

y/0.1 = 1.613

y = 0.1×1.613 = 0.1613 mol of unknown compound

Molar mass of unknown compound = mass/number of moles = 31 g/ 0.1613 mol = 192.2 g/mol

You might be interested in
A hydrated blue copper(II) sulfate salt with a formula YCuSO4•XH2O is heated until it is completely white in color. The student
Mariulka [41]

Answer:

X = 5

Explanation:

The molar ratio of water to copper(II) sulfate must be found.

The mass of water that must have been eliminated from the salt is found by the difference in weight before and after:

(500 g) - (320 g) = 180 g water eliminated

The moles of water (MW 18.02 g/mol) is then found:

(180 g) / (18.02g/mol) = 9.9889...mol

The mass of the dehydrated copper(II) sulfate (MW 159.609 g/mol) is converted to moles:

(320 g) / (159.609 g/mol) = 2.004899...mol

The molar proportion of water to the copper(II) sulfate is then calculated:

(9.9889...mol H₂O) / (2.0034899...mol CuSO₄) ≅ 5

3 0
3 years ago
Which process transfers heat from inside earth to its surface
Over [174]
Answer is: thermal conduction.
<span>Thermal conduction is the transfer of heat through physical contact. Thermal conduction is the transfer of heat by microscopic collisions of particles. Heat spontaneously flows from a hotter to a colder body.
</span><span>The thermal energy of that core is transferred to the surface of the Earth and lower levels of the oceans by conduction. Water in lakes and oceans transfers heat to the surface by convection.</span>
4 0
3 years ago
Read 2 more answers
Calculate the molarity of a 2.43 mol aqueous NaCl solution with a density of 2.00 g/mL.
anygoal [31]

Answer:

You need to add more points people will not answer if its this low

Explanation:

3 0
3 years ago
Helen adjusts the armature of an electric generator by increasing the number of coils around the iron core. what is helen most l
Veseljchak [2.6K]
Increase the amount of current

3 0
3 years ago
Read 2 more answers
What products would you expect from the reaction of ammonia and sulfuric acid in aqueous solution? 2nh3(aq)+h2so4(aq)→ ?
arsen [322]
From the reaction of ammonia and sulfuric acid in aqueous solution 2nh3(aq)+h2so4(aq)<span>→</span> (NH4)2SO4 + H2O will be formed.Sulfuric acid is diprotic so is able to give up 2 H+ ions. It is an acid-base neutralisation reaction forming ammonium sulphate as the salt. 2NH3 with H2SO4 reacts in a neutralization reaction to form salt water, with ammonium sulphate left behind to crystallize after evaporation.
5 0
3 years ago
Other questions:
  • Define atomic size, electronegativity, and ionization energy and explain how they vary at different places on the periodic table
    10·1 answer
  • How many times faster will oxygen gas diffuse than carbon dioxide
    10·1 answer
  • Two compounds are mixed. Which statement is true if there is only a physical reaction? A. The color changes. B. Heat is release
    11·2 answers
  • Which of the following processes is responsible for producing large amounts of snow in Buffalo, New York? A.) mountain lift effe
    10·2 answers
  • Name an element which matches the description
    5·1 answer
  • A Person in Charge is required at food establishments: A. During the beginning of each shift B. During the end of each shift C.
    9·1 answer
  • Label each bond in the following compounds as ionic or covalent (10) (a) F2 (b) LiBr (c) NaNH2 (d) CH3CH3
    13·1 answer
  • A glass of room temperature water is placed into the refrigerator.Which of the following statements are true?
    13·1 answer
  • At the beach, Kim noticed that breezes blew from the ocean to the land during the day and from the land to the ocean at night. W
    11·2 answers
  • Click this link to view O*NET's Work Context section for Emergency Medical Technicians. Note that common tools
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!