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
Semenov [28]
3 years ago
8

Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 79.0

% Cu and 21.0% Zn by mass has a density of 8740 kg/m3.What is the molality and molarity of Zn in the solid solution?
Chemistry
1 answer:
Bas_tet [7]3 years ago
4 0

<u>Answer:</u> The molality and molarity of zinc in the solution is 4.07 m and 28.11 M respectively.

<u>Explanation:</u>

Solute is the substance which is present in smaller proportion in a mixture and solvent is the substance which is present in larger proportion in a mixture.

We are given:

(m/m) % of Cu = 79 %

This means that 79 g of copper is present in 100 grams of alloy.

(m/m) % of Zn = 21 %

This means that 21 g of zinc is present in 100 grams of alloy.

As, zinc is present in smaller proportion. So, it is solute and copper is the solvent.

  • <u>Calculating molality of zinc:</u>

To calculate molality of the zinc, we use the equation:

Molality=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}

where,

m_{solute} = Given mass of solute (Zinc ) = 21 g

M_{solute} = Molar mass of solute (Zinc) = 65.3 g/mol

W_{solvent} = Mass of solvent (copper) = 79 g

Putting values in above equation, we get:

\text{Molality of Zinc}=\frac{21\times 1000}{65.3\times 79}\\\\\text{Molality of zinc}=4.07m

  • <u>Calculating molarity of zinc:</u>

To calculate volume of a substance, we use the equation:

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

Density of solution = 8740kg/m^3=\frac{8740kg\frac{1000g}{1kg}}{1m^3\times \frac{10^6cm^3}{1m^3}}=\frac{8740g}{1000cm^3}=8.740g/cm^3

(Conversion factors used are:  1 kg = 1000 g &  1m^3=10^6cm^3  )

Mass of solution = 100 g

Putting values in above equation, we get:

8.740g/cm^3=\frac{100.0g}{\text{Volume of zinc}}\\\\\text{Volume of zinc}=11.44cm^3

To calculate the molarity of solution, we use the equation:

\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}

We are given:

Molar mass of zinc = 65.3 g/mol

Volume of solution = 11.44cm^3=11.44mL     (Conversion factor:  1cm^3=1mL  )

Mass of zinc = 21.0 g

Putting values in above equation, we get:

\text{Molarity of zinc}=\frac{21\times 1000}{65.3\times 11.44}=28.11M

Hence, the molality and molarity of zinc in the solution is 4.07 m and 28.11 M respectively.

You might be interested in
Can someone tell me plz :P
NemiM [27]

Answer:

There's nothing there

Explanation:

8 0
3 years ago
first used the term cell when he used a (5)_____ to observe box-like structures when he was examining cork under a microscope. (
MrRa [10]

Answer:

sorry if its wrong.

Explanation:

(5) a cell was used to refer to these tiny units of life

(6) Robert Hooke

(7)  cell walls

(8) modern cell theory. im so sorry if im wrong.

3 0
2 years ago
Both hydrogen sulfide (H2S) and ammonia (NH3) have strong, unpleasant odors. Which gas has the higher effusion rate? If you open
Artist 52 [7]

Answer:

yooooo D kardi

Explanation:

3 0
3 years ago
HELP PLSSPLSPLSSS ILL GIVE BRAINLIEST
ICE Princess25 [194]
The lungs. it travels to the lungs
7 0
2 years ago
Which procedure(s) decrease(s) the random error of a measurement:
PolarNik [594]

Taking the average of more measurements decreases random error of measurement

Taking the average of many measurements is the most effective way to reduce random errors in a measurement. Because the certainty of the results grows as the number of data does, Less risk of random errors means that the value is more certain. Fewer measurements lead to less reliable data collection, which raises the likelihood of random errors.

The complete question is

Which procedure(s) decrease(s) the random error of a measurement: (1) taking the average of more measurements: (2) calibrating the instrument; (3) taking fewer measurements? Explain

To learn more about random errors:

brainly.com/question/14149934

#SPJ4

8 0
1 year ago
Other questions:
  • A sample of gas of 752 torr and occupies a volume of 5.12 L. What will the new volume be when the pressure is increased to 1.5 A
    9·1 answer
  • State and explain modern periodic table. ⊕⊕
    15·2 answers
  • #1: Which of the following statements is true?
    14·2 answers
  • What are the Eight types of bloodstain patterns ?
    9·2 answers
  • What factors are included on a phase diagram?
    13·1 answer
  • Phosphates are formed when phosphorus reacts with
    11·1 answer
  • Assume you find four bottles in an empty laboratory, each containing a liquid. The labels that were on these bottles have fallen
    14·1 answer
  • Which of the following elements has the largest atomic radius? (2 points)
    15·2 answers
  • Identify the pair in whic 1 the formula does not match the name
    14·2 answers
  • Which element does not like to bond with other atoms?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!