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
balu736 [363]
2 years ago
5

A certain liquid has a normal boiling point of and a boiling point elevation constant . A solution is prepared by dissolving som

e urea () in of . This solution boils at . Calculate the mass of that was dissolved. Round your answer to significant digits.
Chemistry
1 answer:
PSYCHO15rus [73]2 years ago
8 0

This question is incomplete, the complete question is;

A certain liquid X has a normal boiling point of 150.4 °C and a molar boiling point elevation constant kb is 0.60 °Ckgmol⁻¹.

A solution is prepared by dissolving some urea (NH22CO) in 750 g of X. This solution boils at 150.9 °C . Calculate the mass of urea that was dissolved. Round your answer to 3 significant digits.

Answer:

the mass of urea that was dissolved is 37.5 g

Explanation:

Given the data in the question;

normal boiling point of X; Tb⁰ = 150.4 °C

boiling point of solution Tb = 150.9 °C

Change in boiling point Δt = Tb - Tb⁰  = 150.9 °C - 150.4 °C = 0.5 °C

Kb = 0.6 °C.kg.mol⁻¹

V = 750 g

Now, we know that

Δt = Kb × molality

so

0.5 = 0.6 × molality

molality = 0.5 / 0.6

molality = 0.833

we know that molar mass of urea is 60 g/mol

so

molality = mass × 1000 / molar mass × volume( g )

we substitute

0.833 = ( mass × 1000 ) / ( 60 × 750 )

0.833 = ( mass × 1000 ) / 45000

0.833 × 45000 = mass × 1000

mass = ( 0.833 × 45000 ) / 1000

mass = 37485 / 1000

mass = 37.485 ≈ 37.5 g   { 3 significance figure }

Therefore, the mass of urea that was dissolved is 37.5 g

You might be interested in
Please fill in the blanks.
svetoff [14.1K]

photosynthesis: the process when plants make their own food using sunlight

4 0
3 years ago
After an experiment, scientists write a ___ which summarizes their experiment and results
Rudiy27
After an experiment, scientists write a Conclusion which summarizes their experiment and results.
6 0
3 years ago
Which enzyme of the citric acid cycle most closely resembles the pyruvate dehydrogenase complex in terms of its structure, organ
Furkat [3]

Answer:

The α-ketoglutarate dehydrogenase enzyme is structurally and functionally homologous to the pyruvate dehydrogenase complex.

hope it helps

7 0
2 years ago
Often in organic synthesis reactions, multiple products will be synthesized that need to be separated from each other. The separ
stiv31 [10]

Answer:

True

Explanation:

The chemical method of separating two compounds depends on their difference in solubility in water, ether, dilute acid or alkali. Separatory funnel thus, are used to distinguish immiscible fluids from their solutes. The funnel is usually made of glass, pear-shaped, and usually contains a stopper and a stopcock.

8 0
3 years ago
What is the correct chemical name for the molecular compound if6?
Sati [7]
Iodine hexafluoride is the chemical name
5 0
3 years ago
Other questions:
  • Sodium hydroxide is a substance that causes severe burns. It is used in many educational laboratory activities but, because of i
    6·1 answer
  • Which of the following substances is non-living and is the smallest part of all matter?
    9·2 answers
  • : Name the parts of transverse waves?
    7·1 answer
  • How is a mixture different from a compound? 1. Particles of a mixture are combined chem2. Components of a mixture can be sepa- r
    10·1 answer
  • What is the modification of the Dalton's atomic theory​
    11·2 answers
  • PLEASEE HELPP MEEE WITH NUMBER 5!!!!!!<br> please explain why!!!!
    8·1 answer
  • A student claims that if she wanted to make a solution quickly, she should use small pellets instead of powder along with heatin
    8·1 answer
  • Warm Up
    12·2 answers
  • Question 15
    7·1 answer
  • The heaviest known alkaline earth metal is radium, atomic number 88.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!