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
nikdorinn [45]
3 years ago
7

A solution is made by dissolving 15.5 grams of glucose (C6H12O6) in 245 grams of water. What is the freezing point depression of

the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.
Chemistry
1 answer:
sergij07 [2.7K]3 years ago
7 0
From the equation; ΔTf = Kf × m
Where, Kf for water = 1.853 K kg/mole; m is the molarity = number of solute/amount of solvent in kg.
Glucose is the solute whose molecular mass is 180 g/mole and water is the solvent. 
Moles of solute = 15.5/180 = 0.0861 moles
Amount of solvent in kg = 245/1000 = 0.245 Kg
Therefore; molarity = 0.0861/0.245 = 0.3515 moles/Kg
Therefore; ΔTf = 1.853 × 0.3515 = 0.6513 K
Hence; the depression in freezing point is 0.6513 
The freezing point of solution will therefore be;
= 273 - 0.6513 = 272.3487 K

You might be interested in
At 373.15K and 1 atm, the molar volume of liquid water and steamare 1.88 X 10-5 m3 and 3.06 X 10-2m3, respectively. Given that t
professor190 [17]

Answer The value of \Delta H and \Delta U is, 40.79 kJ and 37.7 kJ respectively.

Explanation :

Heat released at constant pressure is known as enthalpy.

The formula used for change in enthalpy of the gas is:

\Delta Q_p=\Delta H=40.79kJ/mol

Now we have to calculate the work done.

Formula used :

w=-P\Delta V\\\\w=-P\times (V_2-V_1)

where,

w = work done  = ?

P = external pressure of the gas = 1 atm

V_1 = initial volume = 1.88\times 10^{-5}m^3=1.88\times 10^{-5}\times 10^3L=1.88\times 10^{-2}L

V_2 = final volume = 3.06\times 10^{-2}m^3=3.06\times 10^{-2}\times 10^3L=3.06\times 10^{1}L

Now put all the given values in the above formula, we get:

w=-(1atm)\times (3.06\times 10^{1}-1.88\times 10^{-2})L

w=-30.5812L.atm=-30.5812\times 101.3J=-3097.87556J=-3.09\times 10^3J=-3.09kJ

Now we have to calculate the change in internal energy.

\Delta U=q+w

\Delta U=40.79kJ+(3.09kJ)

\Delta U=37.7kJ

Thus, the value of \Delta H and \Delta U is, 40.79 kJ and 37.7 kJ respectively.

4 0
3 years ago
Would you measure the height of a building in meters?
olga nikolaevna [1]
<span>Yes. If you are using the metric system, then this the most accurate </span>
6 0
3 years ago
Read 2 more answers
Find the Nazca plate and the South American plate. How are they different? Are they moving toward or away from each other?
Otrada [13]
<span>The Nazca plate is an oceanic plate, while the South American plate is continental. The fast moving Nazca plate is moving east towards the South American plate at a downward angle and converging. This process is called subduction, resulting in frequent earthquakes & production of the Andes Mountains.</span>
7 0
3 years ago
Pls help me with my chemistry finals test.
Nutka1998 [239]
What do you need help with? Can you specify?
3 0
3 years ago
What human life process requires hydrochloric acid? <br><br> THANKS!!!
notka56 [123]
The answer is Enzyme
7 0
3 years ago
Other questions:
  • A student sets up two reactions. reaction 1 uses 0.130 mol/l of reactant, and reaction 2 uses 0.440 mol/l of reactant. how many
    14·2 answers
  • Air is composed of 79%N^2, 21% O^2. if the air pressure is 101.3 kPa, what are the pressures of N^2 and O^2
    6·1 answer
  • Which fuel is better renewable or non-renewable fuel and give a reason why
    15·1 answer
  • How much precipitation does the tundra get?
    11·1 answer
  • What solution turns litmus paper blue? A. acidic B. basic C. neutral D. none
    10·2 answers
  • If a system has 2.00 × 10 2 kcal 2.00×102 kcal of work done to it, and releases 5.00 × 10 2 kJ 5.00×102 kJ of heat into its surr
    13·1 answer
  • 50 POINTS!!!!!
    10·2 answers
  • Which is the solution to 8x=3x+2
    5·2 answers
  • What is the amount of heat needed to raise the temperature of 1kg of that substance by 1 degree Celsius?
    7·1 answer
  • Whos good at the periodic table cus im not help
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!