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
Rina8888 [55]
3 years ago
8

A beaker contains 450 g of water (H2O). If 9.2 g of calcium fluoride (CaF2) is added, what is the molality concentration of the

solution?
Chemistry
1 answer:
lord [1]3 years ago
6 0
Molality = number of mole of solute in  1kg= 1000g solvent.

Solute is CaF2.
Molar mass (CaF2) = M(Ca) +2M(F) = 40.1 + 2*19.0 = 78.1 g/mol

9.2 g CaF2 * 1 mol CaF2/78.1 g CaF2 = 0.12 mol CaF2

Solvent is water 450 g.

0.12 mol CaCl2 -------450 g water
x mol CaCl2    --------- 1000 g water

x=0.12*1000/450 = 0.27 

Molality is 0.27 (mol CaF2 in 1 kg water).

You might be interested in
Which part of the mantle is still a solid but flows like a thick, heavy liquid?
marusya05 [52]

Hello!

Your answer is A, asthenosphere

<u>The asthenosphere is a part of the mantle</u>. It helps move the plates in the Earth.

It is <u>below the lithosphere,</u> between <u>80 and 200 km</u> below the surface.

Therfore, the asthenosphere is <u>the part of the mantle that is still a solid but flows like a thick, heavy liquid.</u>

<u />

Hope this helps!

Have a great day!

3 0
4 years ago
Read 2 more answers
Elements in the same period of the periodic table exhibit similar physical and chemical properties.
Vladimir [108]

Answer:

same valency electrons

Explanation:

example g 1 elements

5 0
3 years ago
Which of the units is NOT a measure of pressure ?
DedPeter [7]

Answer:

Dynes

Explanation:

Dynes is not a unit of pressure. Dynes is CGS unit of force.

8 0
4 years ago
What sentence describes energy
kaheart [24]

Answer:

It measures the capacity to do work.

Explanation:

8 0
3 years ago
Read 2 more answers
Determine the molecular weight for mg(no3)2.
Gekata [30.6K]
Molecular Weight (MW) is the sum of the atomic weights/masses (AM) of every atom in a compound or molecule. Thus, we would add the AM of Mg + 2×[N+(O×3)]:
Mg = 24.31
N = 14.01
O = 16
So we have: Mg + 2×[N+(O×3)] = 24.31 + 2×[14.01+(16×3)] = 24.31+2×[14.01+48] = 24.31+ 2×62.01 = 24.31+124.02 = 148.33

C) is the correct answer
3 0
3 years ago
Read 2 more answers
Other questions:
  • If you needed to make 100 mL of a 0.2 M fruit drink solution from the 1.0 M fruit drink solution, how would you do it? (Hint: Us
    9·2 answers
  • Why can't there be a temperature lower than absolute zero?
    10·1 answer
  • A compound consisting of atoms of large atomic mass is more likely to require:
    5·2 answers
  • What nevres carrys information from the hairs inside the cochlea?
    6·1 answer
  • At what temperature will water change from a liquid to a solid?
    13·2 answers
  • which type of matter is composed of two or more elements that are chemically combined in a fixed proportion
    12·1 answer
  • A student’s experiment showed that her egg gained mass overnight with the vinegar and distilled water. She had about a +1% chang
    12·1 answer
  • R;lhjgskdrjlvfgnjsdj,fiogjgndgf
    15·1 answer
  • A box of pills claims that they will make your cold go away sooner. Who
    13·1 answer
  • PLEASE HELP SOON!!!!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!