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
densk [106]
3 years ago
11

A solution made by dissolving 14.2g of sucrose in 100g water exhibits a freezing point depression of 0.77 degrees. Calculate the

molar mass of sucrose
Chemistry
1 answer:
Nataly [62]3 years ago
5 0

For the purpose we have to know following equation for freezing point depression:


ΔTf=Kf*b


and that Kf of water is 1.86°C/m.


From the formula we can determine molality (b):


b=Δtf/Kf=0.77/1.86= 0.414 mole/kg


Now when we know molality, we can calculate mass of sucrose in solution:


b=n/m(H20)   =>  n(sucrose)=b*m(H20) = 0.414 mole/kg *0.1 kg = 0.0414 mole


Finally, we can determine the molar mass of sucrose:


M=m/n=14.2/0.0414= 343g/mole

You might be interested in
When taking a measurement with a pH meter, keep the instrument in the ______________ until it is needed. Rinse the pH meter with
nydimaria [60]

Answer:

Storage solution; deionized water; stabilizes.

Explanation:

The pH scale measures the concentration of hydrogen ions in acidic and alkaline solutions.

In chemistry, it literally means power of hydrogen ions and it is a measure of the molar concentration of hydrogen ions in a particular solution, thus specifying the acidity, neutrality or basicity of chemical solutions.

Mathematically, the pH of a solution is given by;

pH = -log_{10}(H^{+})

Hence, a solution with a pH of 7 is neutral. Also, a solution with a pH below 7 is acidic but basic (alkaline) if it's pH is above 7.

A pH meter can be defined as a scientific instrument or device designed and developed for the measurement of the hydrogen-ion concentration in water-based solutions, in order to determine their level of acidity or alkanility.

When using a pH meter to take a measurement, you should keep it in a storage solution until it is needed. Also, a deionized water should be used to rinse the pH meter and gently pat dry.

Furthermore, the pH meter should be placed in a given sample solution and a reading of the measurement taken when the pH of the solution stabilizes.

8 0
3 years ago
The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene?
Natalija [7]
You got the answer correct. If you would double check
given:C (12 g/mol) H (1 g/mol). 

12(8) + 1(8) = 104 g/mol

and for C2H4
12(2)+1(4) = 28g/mol

Also, chemical formula of styrene is<span> C6H5CH=CH2.</span>
7 0
2 years ago
Read 2 more answers
Does volume alone determine whether an object will sink or float? Explain.
Bond [772]

Answer:

no.

Density (mass / volume) determines whether an object floats or sinks. If the object is less dense than the medium in which it has been submerged, it floats. if it is more dense, it sinks. Volume will definitely determine if a steel ship floats, as steel is far more dense than water.

#FreeMelvin

3 0
3 years ago
Read 2 more answers
Which element would you expect to be more reactive: phosphorus (P) or fluorine (F)
Studentka2010 [4]

Answer:

Fluorine

Explanation:

Fluorine is the most electronegative element because it has 5 electrons in it's 2P shell.

4 0
2 years ago
Read 2 more answers
Which state of matter has a constant volume, but changes shape?\?
never [62]
Liquids stays the same volume but the bonds are spaced out enough that it can take the shape of whatever container it’s in.
8 0
3 years ago
Other questions:
  • A ______ property describes how a substance acts when it reacts with other substances.
    8·2 answers
  • a.) What is the minimum uncertainty in an electron's velocity (Δmin) if the position is known within 13 Å? b.) What is the minim
    15·1 answer
  • According to the following reaction, how many moles of chlorine gas are necessary to form 0.739 moles carbon tetrachloride? carb
    7·1 answer
  • Pepsin is an enzyme involved in the process of digestion. Its molar mass is about 3.50 × 104 g/mol. What is the osmotic pressure
    9·1 answer
  • The crucial difference between relative dating and absolute dating is that
    13·2 answers
  • Increasing the temperature of gas in a container that cannot expand is a way to _______. decrease the volume of the gas decrease
    14·1 answer
  • Which is not a property of a gas? * exert pressure high density High compressibility readily soluble
    5·1 answer
  • Extremely lost... the world is cold. Plz help
    15·1 answer
  • Carbon tetrachloride is an iconic compound true or false
    7·2 answers
  • Why did me need to have the same molecules in each bottle? and what would have happened if we didn't use the same molecules?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!