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
Varvara68 [4.7K]
2 years ago
15

The concentration of urea in a solution prepared by dissolving 16 g of urea in 20 g of H2OH2O is ________% by mass. The molar ma

ss of urea is 60.0 g/mol. The concentration of urea in a solution prepared by dissolving 16 g of urea in 20 g of is ________% by mass. The molar mass of urea is 60.0 g/mol. 44 80 0.80 0.48 0.44
Chemistry
1 answer:
Arada [10]2 years ago
4 0

Answer:

44

Explanation:

Given that :

Mass of solute = Mass of urea = 16g

Mass of water = 20g

Mass of solution = (mass of solute + mass of solvent) = (mass of urea + mass of water) = (16g + 20g) = 36g

Percentage Mass = (mass of solute / mass of solution) * 100%

Percentage Mass = (16 / 36) * 100%

Percentage Mass = 0.4444444 x 100%

Percentage Mass = 44.44%

Percentage Mass = 44%

You might be interested in
What similarities do weather and climate have?
tester [92]
Some of the similarities between weather and climate include how both refer to temperature and how they are not always the same everywhere. In addition, the weather and climate intersect in various ways, for example the climate dictates the weather in various locations.
5 0
2 years ago
In a 1.143E+2 g sample of iron(III) oxide, how many grams of iron are present? Your answer should have the appropriate number of
Fiesta28 [93]

Mass of iron(III)oxide, Fe2O3 sample = 1.143*10^2 g

Molar mass of Fe2O3 = 159.69 g/mole

i.e. 1 mole of Fe2O3 weighs 159.69 g

Based on stoichiometry:

1 mole of Fe2O3 has 2 moles of Fe

Atomic mass of Fe = 55.85 g/mole

Therefore we can write:

159.69 g of Fe2O3 is composed of 2*55.85 g of Fe

Thus, amount of Fe present in 1.143*10^2 g sample of Fe2O3 is

= 1.143*10^2 * 2* 55.85/159.69

= 7.995*10^-1 g

6 0
3 years ago
A solution of NaCl has a concentration of 1.50 M. The density of the solution is 1.06 g/mL. What is the concentration solution b
gavmur [86]

<u>Answer:</u>

<em>The concentration solution by percent in mass is 8.28%</em>

<u>Explanation:</u>

Molarity is moles of solute present in 1L of its solution .

Hence the formula is  

$\left.\text {Molarity}=\frac{\text {moles of solute}}{\text {Volume of solution in } L} \text { (unit is } \frac{\text { mol }}{L} \text { or } M\right)=\frac{1.50 \mathrm{mol}}{1 \mathrm{L}}$

Let us convert the numerator and the denominator into mass in g

Numerator :                                  

mass $=$ moles $\times$ molar mass\\\\$=1.50 \mathrm{mol} \times 58.5 \frac{g}{\text { mol }}=87.75 \mathrm{g}$ (solute)

Denominator :                        

$\begin{aligned} \text {mass} &=\text { density } \times \text {volume}=\frac{1.06 \mathrm{g}}{1 \mathrm{ml}} \times 1 \mathrm{L} \\\\ &=\frac{1.06 \mathrm{g}}{1 \mathrm{ml}} \times 1000 \mathrm{ml}=1060 \mathrm{g} \end{aligned}$

The formula to find mass percentage is

$\%$ mass $=\frac{\text { mass of solute }}{\text { mass of solution }} \times 100 \%$

$\%$ mass of $\mathrm{NaCl}=\frac{\text { mass of solute }}{\text { mass of solution }} \times 100 \%$

$=\frac{87.75 g}{1060 g} \times 100 \%$\\

=8.28% (Answer)

7 0
3 years ago
Read 2 more answers
Charles’ law explains which of these phenomena?
irakobra [83]
The answer is A. <span>why a balloon deflates when the air around it cools </span>
8 0
3 years ago
Read 2 more answers
What is the color of bromcresol green indicator in a solution with a pH of 2.0
Mila [183]

Answer:

The pH value is 2.0, which is less than 3.8, therefore bromcresol green will be of yellow color.

5 0
3 years ago
Other questions:
  • Would would it be like without geneticists
    12·1 answer
  • The half reaction of an oxidation-reduction reaction shows that iron gains electrons. What does this electron gain mean for iron
    14·2 answers
  • What are the terms: organic compound and organic chemistry?
    8·1 answer
  • Why do living things need water, food, and space
    15·2 answers
  • What is the activity of a 54.7 μCi sample of carbon-14 in becquerels?
    13·1 answer
  • Which structure is found in plant cell but not in an animal cell ?
    10·1 answer
  • The coloured gas is​
    7·1 answer
  • Why does onions burn your eyes?
    15·2 answers
  • Challenge Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen, 21 percent oxygen, and 1 percent argon. (
    5·1 answer
  • Perform the following operation and express the answer in scientific notation 8.6500x10^3+6.5500x10^5
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!