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
Anna [14]
3 years ago
12

Mercury has an atomic number of 80 and a mass number of 200.

Chemistry
2 answers:
denis23 [38]3 years ago
8 0
C. The mass number is the amount of Protons and electrons there are combined, so 200 - 80 is 120.
steposvetlana [31]3 years ago
3 0

<u>Answer:</u> The correct answer is Option c.

<u>Explanation:</u>

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons present in an atom.

Mass number = Number of neutrons + Number of protons.

We are given:

Atomic number = 80

Mass number = 200

Number of neutrons = Mass number - Atomic number = 200 - 80 = 120

Hence, the correct answer is Option c.

You might be interested in
Give the name and symbol of the prefixes used with SI units to indicate multiplication by the following exact quantites.
Bingel [31]

Answer:

A. Kilo , K, multiplication by 1000

B. Centi, c

C. Deci, d

D. Mili, m

E. Mega, M

F. Micro, u

7 0
3 years ago
Which oneof the following would best be measured useing kilometers
Alex
A. the distance between towns
5 0
3 years ago
Read 2 more answers
On a victim, a circular entrance wound with black edges is found. Which most likely caused this wound?
castortr0y [4]

The answer is D. my friend :)

4 0
3 years ago
Read 2 more answers
When methane is burned with oxygen, the products are carbon dioxide and water. if you produce 9 grams of water and 11 grams of c
Alina [70]
4 grams of methane is <span>burned with oxygen,.  Hope this helped</span>
3 0
3 years ago
A 0.4322 g sample of a potassium hydroxide – lithium hydroxide mixture requires 27.10 mL of 0.3565 M HCl for its titration to th
Yuki888 [10]

The mass percent lithium hydroxide in the mixture with potassium hydroxide, calculated from the equivalence point in the titration of HCl with the mixture, is 19.0%.  

The mass percent of lithium hydroxide can be calculated with the following equation:  

\% = \frac{m_{LiOH}}{m_{t}} \times 100    (1)

Where:

m_{t} = m_{KOH} + m_{LiOH} = 0.4322 g   (2)  

We need to find the mass of LiOH.

From the titration, we can find the number of moles of the mixture since the number of moles of the acid is equal to the number of moles of the bases at the equivalence point.    

\eta_{HCl} = \eta_{LiOH} + \eta_{KOH}

0.0271 L*0.3565 \frac{mol}{L} = \eta_{LiOH} + \eta_{KOH}

\eta_{LiOH} + \eta_{KOH} = 9.66 \cdot 10^{-3} \:mol

Since mol = m/M, where M: is the molar mass and m is the mass, we have:

\frac{m_{LiOH}}{M_{LiOH}} + \frac{m_{KOH}}{M_{KOH}} = 9.66 \cdot 10^{-3} \:mol    (3)                                        

Solving equation (2) for m_{KOH} and entering into equation (3), we can find the mass of LiOH:  

\frac{m_{LiOH}}{M_{LiOH}} + \frac{0.4322 - m_{LiOH}}{M_{KOH}} = 9.66 \cdot 10^{-3} \:mol    

\frac{m_{LiOH}}{23.95 g/mol} + \frac{0.4322 g - m_{LiOH}}{56.1056 g/mol} = 9.66 \cdot 10^{-3} \:mol              

Solving for m_{LiOH}, we have:

m_{LiOH} = 0.082 g

Hence, the percent lithium hydroxide is (eq 1):

\% = \frac{0.082 g}{0.4322 g} \times 100 = 19.0 \%  

Therefore, the mass percent lithium hydroxide in the mixture is 19.0%.

Learn more about mass percent here:

  • brainly.com/question/6992535?referrer=searchResults
  • brainly.com/question/5840377?referrer=searchResults

I hope it helps you!                        

5 0
2 years ago
Other questions:
  • Which observation illustrates the law of conservation of mass?
    11·1 answer
  • Use Lewis diagrams to show how electrons are shared to form covalent bonds in compounds wit the following atoms. Write the formu
    6·1 answer
  • Easy Chemistry Help?
    11·1 answer
  • A container holds 1 mole of helium gas. The volume of the container is 2 liters and the pressure inside the container is 105.0 k
    11·1 answer
  • How can you tell if a chemical equation is balanced
    8·1 answer
  • Is the following statement sometimes, always or never true: Compounds
    15·1 answer
  • Why do the more complex sugar disaccharides store more energy than<br> monosaccharides?
    8·1 answer
  • Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of CH3Cl. a. The electron-pair geometry is lin
    15·1 answer
  • Help me please!!!!!!
    13·1 answer
  • The heat from the bonfire is transferred to the student's hands through the process of
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!