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
Nadusha1986 [10]
3 years ago
6

8.43g of CaCl2·2H2O is dissolved in 40.0g of H2O. What is the molality of the solution? (Note that the H2O in the CaCl2·2H2O mus

t be included in the molar mass of the compound in order to calculate the moles of solute. Also note that the H2O contributed by this solute must be included in the total amount of solvent present in the solution in calculation of molality.
Chemistry
2 answers:
zheka24 [161]3 years ago
7 0

Answer:

The answer to your question is molality = 1.36 ≈ 1.4

Explanation:

Data

mass CaCl₂ 2H₂O= 8.43 g

mass of water = 40 g

molality = ?

Process

1.- Calculate the molecular mass of CaCl₂ 2H₂O

CaCl₂ 2H₂O = 40 + 71 + 4 + 32 = 147 g

   Calculate the moles of CaCl₂ 2H₂O

                          147 g ----------------- 1 mol

                            8.43 g --------------  x

                             x = (8.43 x 1) / 147

                             x = 0.057 moles

2.- Calculate the mass of H₂O in the solute

                        147 g of CaCl₂ 2H₂O ------------  36 g of H₂O

                          8.43 g CaCl₂ 2H₂O ------------   x

                          x = (8.43 x 36) / 147

                          x = 303.48 / 147

                          x = 2.06 g of H₂O

3.- Total mass of water

     mass of water = 2.06 + 40

                              = 42.06 g

4.- Calculate molality

     molality = number of moles / mass of solvent (kg)

     molality = 0.057 / 0.0421

     molality = 1.4

lara31 [8.8K]3 years ago
3 0

Answer:

[CaCl₂·2H₂O] = 1.43 m

Explanation:

Molality is mol of solute / kg of solvent.

Mass of solvent = 40 g

Let's convert g to kg → 40 g / 1000 = 0.04 kg

Let's determine the moles of solute (mass / molar mass)

8.43 g / 146.98 g/mol = 0.057 mol

Molality = 0.057 mol / 0.04 kg → 1.43

You might be interested in
For what reasons would modern scientists accept dalton's atomic theory but not the idea of an atom proposed by the greek philoso
soldi70 [24.7K]

Solution:

The idea of an atom proposed by the Greek philosophers because:

According to Greek Philosopher, matter is composed of small and indivisible particles called atoms. He introduced atoms as too small to be seen, unchangeable, completely solid without internal structure. He proposed that atoms are of variety of shapes and sizes which is responsible for different types of matter.

But according to Dalton’s atomic theory, chemical elements have atoms, which are identical in weight. The different elements have different atoms of different weight. Atoms can combine in whole-number ratios to form compounds. These observations are already introduced by Greek philosopher, but the idea of atomic weight is introduced by Dalton. He introduced the list of 21 elements with their atomic weights and, he was the first to propose the element’s symbol.

4 0
3 years ago
Can we cover the earth with one mole of pennies?
lara [203]

Answer:

\no

Explanation:

6 0
3 years ago
What is the definition for floating
creativ13 [48]

Answer:

"1. buoyant or suspended in water or air.

2.not settled in a definite place; fluctuating or variable."

Explanation:

Hope this helps! :)

5 0
3 years ago
Read 2 more answers
Complete the word equation for making a salt.
dalvyx [7]

Answer:

acid +alkaline =salt and water

Explanation:

if an acid reacts with an alkaline they form salt and water

4 0
2 years ago
Read 2 more answers
Determine the number of 3s electrons in Na .
Scorpion4ik [409]

Answer:

Explanation:The atomic number of sodium is 11. That is, the number of electrons in sodium is 11. Therefore, a sodium atom will have two electrons in the first shell, eight in the 2nd orbit, and an electron in the 3rd shell.

3 0
1 year ago
Other questions:
  • Tell why small droplets of water on an oily surface are almost spherical.
    14·1 answer
  • Which of these elements has the smallest atomic radius?
    5·1 answer
  • Water can dissolve other substances. Which factor best contributes to this property of water?
    10·2 answers
  • Name the acid which are not sour in taste​
    5·2 answers
  • According to the following thermochemical equation, if 951.1 g of NO 2 is produced, how much heat is released at constant pressu
    13·1 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
  • An irregular lump of an unknown metal has a measured density of 5.50 g/mL. The metal is heated to a temperature of 153 °C and pl
    14·1 answer
  • In the Dumas Method, the volatile sample
    12·1 answer
  • Name ways we use technology in inner and outer space<br> 8th grade science btw
    9·1 answer
  • Which best describes the law
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!