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
alekssr [168]
2 years ago
11

Using the balanced equation below,

Chemistry
2 answers:
Zielflug [23.3K]2 years ago
8 0

Answer:

Mass = 6.538 g

Explanation:

Given data:

Mass of zinc hydroxide produced = 9.65 g

Mass of zinc required = ?

Solution:

Chemical equation:

Zn + 2MnO₂ + H₂O      →      Zn(OH)₂ + Mn₂O₃

Number of moles of zinc hydroxide:

Number of moles = mass/molar mass

Number of moles = 9.65 g/ 99.42 g/mol

Number of moles = 0.1 mol

now we will compare the moles of zinc and zinc hydroxide,

                  Zn(OH)₂           :          Zn

                       1                  :          1

                    0.1                  :         0.1

Mass of zinc required:

Mass = number of moles × molar mass

Mass = 0.1 mol × 65.38 g/mol

Mass = 6.538 g

Helga [31]2 years ago
5 0

Answer: 6.35

Explanation:

You might be interested in
The half-life of 131I is 8.021 days.What fraction of a sample of 131I remains after 24.063 days
Leno4ka [110]
24.063/8.021 = 3 half lives
(1/2)^3 =1/8 
5 0
2 years ago
The half-life of plutonium-239 is 24300. If a nuclear bomb released 8kg of this isotope, how many years would pass before the am
Aneli [31]

Answer:

= 72900 years

Explanation:

  • The half-life is the time taken by a radioactive material to decay by half the original amount.
  • The half-life of plutonium-239 is 24300 years which means it takes 24300 years to decay by half the original amount.

To calculate the time taken for a mass of 8 kg to decay to 1 kg we use;

New mass = Original mass x (1/2) ^n, where n is the number of half-lives

Therefore;

1 kg = 8 kg × (1/2)^n

1/8 = (1/2)^n

solving for n;

n =3

Therefore;

Time = 3 × 24300 years

          = 72900 years

It will, therefore, take 72900 years for 8 kg of plutonium-239 to decay to 1 kg.

3 0
3 years ago
When an ionic compound is placed in water, the positive end of the water molecule is attracted to the cation (+) of the ionic co
Pani-rosa [81]

Answer:

what's the question?I can't answer without a question

3 0
2 years ago
59 Q.No. 28 b Hydrogen peroxide can act as oxidizing as well as reducing agent with example. ​
professor190 [17]

Answer:

Hydrogen peroxide can function as an oxidizing agent as well as reducing agent. 

H2O2 act as oxidizing agent in acidic medium.

Explanation:

Example : 2FeSO4 +H2SO4 +H2O2 —>

(ferrous sulphate)

Fe2(SO4)3 +2H2O

(ferric sulphate)

3 0
1 year ago
27. The density of nickel is 8.91 g/cm3. How large a cube, in cm3, would contain 2.00 x 10^24 atoms of nickel? Use dimensional a
jok3333 [9.3K]

Answer : The volume of the cube is, 21.88cm^3

Solution : Given,

Density of nickel = 8.91g/cm^3

Number of nickel atoms = 2\times 10^{24}

Molar mass of nickel = 58.7 g/mole

First we have to calculate the moles of nickel.

As, 6.022\times 10^{23} atoms form 1 mole of nickel

So, 2\times 10^{24} atoms form \frac{2\times 10^{24}}{6.022\times 10^{23}}=3.321 moles of nickel

The moles of nickel = 3.321 moles

Now we have to calculate the mass of nickel.

\text{ Mass of Ni}=\text{ Moles of Ni}\times \text{ Molar mass of Ni}

\text{ Mass of Ni}=(3.321moles)\times (58.7g/mole)=194.94g

The mass of nickel = 194.94 g

Now we have to calculate the volume of nickel.

Density=\frac{Mass}{Volume}

8.91g/cm^3=\frac{194.94g}{Volume}

Volume=21.88cm^3

Therefore, the volume of the cube is, 21.88cm^3

4 0
3 years ago
Other questions:
  • Atoms of elements with the same electron configuration are organized in ____ in the periodic table.
    10·1 answer
  • Mixtures can be separated by physical changes. Please select the best answer from the choices provided T F
    7·1 answer
  • Calculate moles of 7g of magnesium
    10·1 answer
  • Use Appendix E in the textbook. Which of the following substances can oxidize RuO42−(aq) to RuO4−(aq) under standard conditions?
    7·1 answer
  • Let the ED50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. If the
    6·1 answer
  • What is the electrical power generated from a voltage of 12.3 V if the current is 9.42 amps
    14·1 answer
  • Balance the equations (5pts each) and answer the posed question (5pts each)
    10·1 answer
  • If the reaction is begun with an initial PH3 concentration of 0.95 M, what will be the concentration of PH3 after 30.50 s
    14·1 answer
  • Need help fast!!!!!!!!!!!
    14·1 answer
  • Explain why the surface of the tire melts.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!