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
Alex_Xolod [135]
3 years ago
7

A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250. g of water freezes at –2.34°C. Calculate the molar mass (in

units of g/mol) of the solute. K f of water is 1.86°C/m
Chemistry
1 answer:
Vaselesa [24]3 years ago
3 0

Answer:

M=174.87g/mol

Explanation:

Hello,

In this case, we consider the depression in the freezing point as:

\Delta T=-i*m*Kf

Whereas the van't hoff factor for ascorbic acid is 1 since it is covalent, thus, we solve for the molality as shown below:

(-2.34-0)\°C=-m*1.86\°C/m\\\\m=\frac{-2.34\°C}{-1.86\°C/m} =1.26m

Next, since molal units are mol/kg, we can compute the present moles of ascorbic acid in the 250 g (0.25kg) of water:

n=1.26mol/kg*0.25kg=0.315mol

Finally, the molar mass with the given 55.0 g of ascorbic acid:

M=\frac{55.0g}{0.315mol}\\ \\M=174.87g/mol

Regards.

You might be interested in
Changes to the global climate could include _______.
frosja888 [35]

1. Answer is d. all of the above.

Climate can be defined as the data collection of weather conditions of a long period of time in a certain area. The weather conditions that affect to the climate are temperature, precipitation, atmospheric pressure, wind and so on. Any changes in weather can change the global climate.

2. Answer is c. ozone.

Trees release oxygen and water vapor into the atmosphere but not ozone. The oxygen gas is released by trees as the by-product of photosynthesis. This is the natural way of production of oxygen gas. Water vapor can be released due to the transpiration of trees.

6 0
4 years ago
Read 2 more answers
Evaluate - if you put a scale in an elevator and weigh yourself as you ascend and the descend, does the scale have the same read
N76 [4]
No, when ascending, you would weigh more, and when you descend, you weigh less.

This is due to the difference in the effect of gravity.
4 0
3 years ago
Read 2 more answers
An _______ bond forms when a cation transfers its extra electron to an anion who needs it.
Nitella [24]
An c.ionic  bond forms when a cation transfers its extra electron to an anion who needs it.
For example compound magnesium chloride (MgCl₂) has ionic bond (<span>the </span>electrostatic attraction<span> between oppositely charged </span><span>ions)</span>. Magnesium transfers two electrons (became positive cation) to chlorine (became negative anion).
5 0
3 years ago
You need 1.50 moles of ammonia (nh3) for a reaction at stp. what volume of ammonia must you measure? also,how many molecules of
professor190 [17]
<span>what volume of ammonia must you measure? 

1.50 moles NH3 ( 22.4 L / 1 mole ) = 33.6 L NH3 should be measured

</span><span>how many molecules of nacl are in 23.40 grams nacl

23.40 g NaCl ( 1 mol / 58.44 g) (6.022 x 10^23 molecules / 1 mol ) = 2.4113 x 10^23 molecules

Hope these answer the questions. Have a nice day.</span>
4 0
4 years ago
Can someone help me pls
Inessa [10]

Answer:

The heat would flow from the hot solid to the cool solid until all temperatures are near equal.

4 0
3 years ago
Other questions:
  • It's easiest to weigh------using a balance scale?
    11·1 answer
  • กระบวนการหายใจเกิดขึ้นกับเซลล์ทุกเซลล์หรือไม่ อย่างไร
    15·1 answer
  • Is milk souring a physical or chemical change
    13·2 answers
  • A solution contains 72.0 g of HCI and 468 g of (C6H6). what is the mole fraction of benzene
    8·1 answer
  • A motorist travels a distance of 55.0 mi for 4.25 h how fast did he travel
    6·2 answers
  • Write a net ionic equation for the reaction that occurs when nickel(II) sulfide and excess hydrochloric acid (aq) are combined.
    6·1 answer
  • 5) Which of the elements have a charge of 2-, as determined by their locations on
    10·1 answer
  • Explain two benefits that the flea get from living on a dog.
    11·1 answer
  • What is the value of 100 ºC on the Kelvin scale? A. 100 K B. 273 K C. 373 K D. -373 K E. -300 K
    11·2 answers
  • =
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!