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
Nuetrik [128]
3 years ago
14

The freezing point of 42.19 g of a pure solvent is measured to be 43.17 ºC. When 2.03 g of an unknown solute (assume the van 't

Hoff factor = 1.0000) is added to the solvent the freezing point is measured to be 40.32 ºC. Answer the following questions ( the freezing point depression constant of the pure solvent is 7.67 ºC·kg solvent/mol solute).What is the molality of the solution? m
How many moles of solute are present? mol
What is the molecular weight of the solute? g/molIf the freezing point depression constant of the pure solvent is 7.66 ºC·kg solvent/mol solute calculate the molar mass of the solute. g/mol
Chemistry
1 answer:
vovikov84 [41]3 years ago
4 0

Answer:

The molality of the solution is 0.3716 mol/kg

The number of moles of solute is 0.0157 mol

The molecular weight of the solute is 129.30 g/mol

The molar mass of the solute is 129.32 g/mol

Explanation:

m (molality of the solution) = ∆T/Kf = (43.17 - 40.32)/7.67 = 0.3716 mol/kg

Number of moles of solute = molality × mass of solvent in kilogram = 0.3716 × 0.04219 = 0.0157 mol

Molecular weight of solute = mass/number of moles = 2.03/0.0157 = 129.3 g/mol

When Kf = 7.66 °C.kg/mol

Molar mass = 2.03 ÷ (2.85/7.66 × 0.04219) = 129.32 g/mol

You might be interested in
Which of the following is not an empirical formula?
PtichkaEL [24]
Option C coz it should be ( CNH4)2. Hope i cleared your doubt
7 0
3 years ago
If Santa Claus is in the beach then what will you call him?​
ahrayia [7]

Answer:

good question..... lemme think now LOL

6 0
3 years ago
What is the job of a scientist?
MrMuchimi

Answer:

c i believe, not sure

Explanation:

8 0
3 years ago
Read 2 more answers
Calculate the theoretical yield for the bromination of both stilbenes
podryga [215]

Answer:

cinnamic acid - 150 mg

cis-stilbene - 100 μL

trans- stilbene - 100 mg

pyridinium tribromide - 200-385 mg

For this data:

moles of cinnamic acid = 0.150 g/148.16 g/mol = 0.001 mols

Theoretical mass of dibromoproduct formed = 0.001 mol x 307.97 g/mol = 0.312 g

cis-stilbene (100 ul = 0.1 ml)

moles of cis-stilbene = 0.1 ml x 1.01 g/mol/180.25 g/mol = 0.00056 mols

Theoretical mass of dibromoproduct formed = 0.00056 mol x 340.05 g/mol = 0.19 g

trans-stilbene

moles of tran-stilbene = 0.1 g/180.25 g/mol = 0.00055 mols

Theoretical mass of dibromoproduct formed = 0.00055 mol x 340.05 g/mol = 0.19 g

Explanation:

4 0
2 years ago
What is the value of quantum numbers (n, l, ml, ms) of 2p^3?​
eduard

Answer:

Explanation:

First digit of the 2p^3  gives you value of n,  in this case its = 2, So, n= 2

Second alphabet gives you the value of l,

l=0 =s

l=1 =p

l=3=d

l=4=f

since  "p" is the alphabet  in 2p^3, so in your case lt shoudlbe = 1 right?

ml= -l to +l , that is -1, 0, +1

Ms= +1/2  or -1/2 alaways remains same foe evrything.

6 0
3 years ago
Other questions:
  • Consider this statement: Earth is the only source of gravity in the solar system. Do you agree? Give your reasons.
    13·1 answer
  • When must scientist conduct controlled experiments ?
    13·1 answer
  • An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee.The same kind of coff
    8·1 answer
  • How do the chemical properties of oxides change from left to right across a period? From top to bottom within a particular group
    8·1 answer
  • What energy transfer is occurring when you make a call on a phone?
    10·2 answers
  • HELP ME!!! What is the gravitational potential energy of a 200 Kg wrecking ball that is held up 25 m off the ground?
    14·1 answer
  • When she introduced CO(g) and Cl2(g) into a 1.00 L evacuated container, so that the initial partial pressure of CO was 1.86 atm
    14·1 answer
  • How much force does a 35 kg child have that is running through the house at an acceleration of 20 m/s2?
    14·1 answer
  • Which period on the periodic table do we start to encounter P subshells?
    13·2 answers
  • A Brønsted-Lowry acid Question 9 options: A) has a lower pH than vinegar. B) is any species that donates a proton. C) is any spe
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!