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]
2 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]2 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
The reaction below shows how silver chloride can be synthesized. AgNO3 NaCl Right arrow. NaNO3 AgCl How many moles of silver chl
Otrada [13]

From 15 mol of Silver nitrate, the moles of silver chloride produced have been 15 mol. Thus, option B is correct.

The balanced chemical reaction for the synthesis of silver chloride has been:

\rm AgNO_3\;+\;NaCl\;\rightarrow\;AgCl\;+\;NaNO_3

From the balanced equation, since there has presence equal moles of silver nitrate and sodium chloride, the moles of silver chloride formed has been equivalent. Thus, 1 mole of silver nitrate gives 1 mole of silver chloride.

The moles of silver nitrate available are,  \rm M_A_g_N_O_3=15\;mol

The moles of silver nitrate produced can be given as:

\rm 1\;mol\;AgNO_3=1\;mol\;AgCl\\15\;mol\;AgNO_3=15\;\times\;1\;mol\;AgCl\\15\;mol\;AgNO_3=15\;mol\;AgCl

Thus, the moles of silver chloride produced have been 15 mol. Thus, option B is correct.

For more information about moles produced, refer to the link:

brainly.com/question/10606802

7 0
2 years ago
Read 2 more answers
What dose lava mean in spanish
Marysya12 [62]
Lava means wash in spanish.
4 0
3 years ago
Read 2 more answers
Metals posses varying reduction potentials. Iron can reduce Cu+2 (aq) to copper metal. Silver can reduce Au+ (aq) to gold metal.
natta225 [31]

<u>Answer:</u> The true statement is iron can reduce Au^+(aq) to gold metal

<u>Explanation:</u>

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

A+BC\rightarrow AC+B

Metal A is more reactive than metal B.

We are given:

Iron can reduce copper, silver can reduce gold, sodium can reduce iron and copper can reduce silver metal.

The increasing order of reactivity thus follows:

Au

where, sodium is most reactive and gold is least reactive

For the given options:

<u>Option 1:</u>  Copper cannot easily reduce sodium ion to sodium metal because it is less reactive.

Cu(s)+Na^+(aq.)\rightarrow \text{ No reaction}

<u>Option 2:</u>  Iron cant easily reduce gold ion to gold metal because it is more reactive.

Fe(s)+3Au^+(aq.)\rightarrow Fe^{3+}(aq.)+3Au(s)

<u>Option 3:</u>  Silver cannot easily reduce iron ion to iron metal because it is less reactive.

Ag(s)+Fe^{3+}(aq.)\rightarrow \text{ No reaction}

Hence, the true statement is iron can reduce Au^+(aq) to gold metal

7 0
3 years ago
Write balanced equations for the following reactions
Arte-miy333 [17]

Answer:

See explanation

Explanation:

The shorthand nuclear reaction equations have been given; the first particle in the parentheses is a reactant particle while the second particle is a product particle. These can now be rewritten as the longhand equations as follows;

238/92U + 4/2 He -------> 241/94Pu + 1/0 n

238/92U + 4/2 He ------> 241/94Pu + 1/0 n

14/7N + 4/2 He------> 17/8O + 1/1 p

56/26Fe + 2 4/2 He----> 60/29Cu + 4/2 He

4 0
3 years ago
How many significant figures are in 4.8cm?
kramer

Answer: 2. they are 4 and 8

Explanation: I took the exam. I hope I helped :)

4 0
2 years ago
Other questions:
  • Why is the moon called a pink moon if that is not really its color?
    8·1 answer
  • What processes occur in a plant leaf?
    14·1 answer
  • Please help with my 1.11 asignment and you get 20 points
    14·1 answer
  • A chef fills a 50 mL container with 43.5 g of cooking oil. What is the density of the oil?
    6·2 answers
  • An electrical company charges 15 p per unit of energy (kWh).
    14·1 answer
  • Complete the symbol equation for the preparation of sodium sulfate
    5·1 answer
  • 1) In the image below, determine the temperature in Fahrenheit.*
    12·2 answers
  • Which will have a greater inertia the moon or the earth​
    6·2 answers
  • How many calories of heat are required to raise the temperature of 225g of water from 10.5°C to 43.7°C
    11·1 answer
  • The density of butter is 0.86 g/cm3. what is the mass of 240 cm3 of butter?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!