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
pshichka [43]
3 years ago
8

A solution is prepared from 26.7 g of an unknown compound and 116.2 g acetone, C3H6O, at 313 K. At this temperature the vapor pr

essure of pure acetone is 0.526 atm while that of the solution is 0.501 atm. What is the molecular weight of the unknown compound?
Chemistry
1 answer:
Cloud [144]3 years ago
4 0

Answer:

The molecular weight of the unknown compound is 267.7 g/mol

Explanation:

Lowering vapor pressure → Colligative property where the vapor pressure of solution is lower than vapor pressure of pure solvent

ΔP = P° . Xm

0.526 atm - 0.501 atm = 0.025atm

0.025 atm = 0.526 atm . Xm

Xm = 0.025 atm / 0.526 atm → 0.0475 (mole fraction)

Mole fraction = Moles of solute / Total moles (solute + solvent)

0.0475 = Moles of solute / Moles of solute + Moles of solvent

We determine the moles of solvent → 116.2 g . 1mol / 58 g = 2 moles

0.0475 = Moles of solute / Moles of solute + 2

0.0475 moles of solute + 0.095 = Moles of solute

0.095 = Moles of solute - 0.0475 moles of solute

0.095 / 0.9525 = Moles of solute → 0.0997 moles

Molas mass = g/mol → 26.7 g / 0.0997 mol = 267.7 g/mol

You might be interested in
What is matter ????????
Debora [2.8K]
Matter is everything and everything is made of matter, everything physical at least
4 0
3 years ago
Read 2 more answers
Which of the following is true for an excess reactant?
kupik [55]

Answer:

C) It is the reactant that is left over after the reaction stops.

Explanation:

The excess reactant is the reactant that is left over after the reaction stops. The extent of the reaction is not determined by this reactant.

A limiting reactant is a reactant that is in short supply within a given reaction.

Such reactants determines the extent of chemical reaction.

  • Limiting reactants are used up in a chemical reaction.
  • The excess reactants remains unchanged after the reaction.
8 0
3 years ago
Which element is similar to the properties bromine?
Ainat [17]

Answer: Fluorine

Explanation: It belongs in the same group as Bromine

8 0
3 years ago
A neutral atom becomes a positive ion when it
Alexeev081 [22]

Answer:

Neutral atoms can be turned into positively charged ions by removing one or more electrons.

Explanation:

If there is an atom that has 9 protons and 9 electrons, removing an electron from the atom will gain a postive charge.

8 0
3 years ago
Read 2 more answers
Which of the following is a solution? (2 points)
diamong [38]
An alloy maybe could be used as a solid but i really don't think that would be it so i would sayether from an alloy or dirt
7 0
3 years ago
Other questions:
  • Convert 876 millimeters to grams
    13·2 answers
  • Wolff-kishner reduction (hydrazine, koh, ethylene glycol, 130°c) of the compound shown gave compound
    6·1 answer
  • In the first step of the reaction, which compound is the limiting reagent: sodium hydroxide or the nucleophile
    5·1 answer
  • What tool(s) does God give us to help us in our everyday lives? PLZ HURRY!!!!!!!!!!!!!
    7·1 answer
  • A softball travels 30m in 3s. What is the speed of the car?
    7·1 answer
  • I need this ASAP! Thank you!
    10·2 answers
  • Which of the following factors could prolong the availability of fossil fuels
    10·2 answers
  • If a car has a force of 490 N forward and encounters a backwards force of
    5·1 answer
  • What dose science do
    14·2 answers
  • 9. A box is pushed 1.5 m to the right in 5 s. What is the box’s average speed to the nearest hundredth of a m/s? *
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!