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
valentinak56 [21]
3 years ago
7

ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST

Chemistry
1 answer:
QveST [7]3 years ago
6 0
Average atomic mass = .374 ( 184.953 amu ) + .626 ( 186.958 amu ) =
186.207 amu
Hope this helps x
would love to have brainliest if it is right! :)
You might be interested in
What should a consumer consider when shopping for a credit card? Check all that apply.
Svetlanka [38]
The initial fees to open the account.
The fees charged for late payment.
The annual percentage rate for the card.
7 0
3 years ago
Read 2 more answers
Chromium(III) oxide can be prepared by heating chromium(IV) oxide in vacuo at high temperature: 4Cr02 —2Cr2O3 +02 The reaction o
kkurt [141]

<u>Answer:</u> The theoretical yield and percent yield of chromium (III) oxide is 434.72 grams and 92.6 % respectively.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

Given mass of CrO_2 = 480.1 g

Molar mass of CrO_2 = 84 g/mol

Putting values in equation 1, we get:

\text{Moles of }CrO_2=\frac{480.1g}{84g/mol}=5.72mol

For the given chemical equation:

4CrO_2\rightarrow 2Cr_2O_3+O_2

By Stoichiometry of the reaction:

4 moles of CrO_2 produces 2 moles of chromium (III) oxide

So, 5.72 moles of CrO_2 will produce = \frac{2}{4}\times 5.72=2.86mol of chromium (III) oxide

Now, calculating the mass of chromium (III) oxide from equation 1, we get:

Molar mass of chromium (III) oxide = 152 g/mol

Moles of chromium (III) oxide = 2.86 moles

Putting values in equation 1, we get:

2.86mol=\frac{\text{Mass of chromium (III) oxide}}{152g/mol}\\\\\text{Mass of chromium (III) oxide}=(2.86mol\times 152g/mol)=434.72g

To calculate the percentage yield of chromium (III) oxide, we use the equation:

\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100

Experimental yield of chromium (III) oxide = 402.4 g

Theoretical yield of chromium (III) oxide = 434.72 g

Putting values in above equation, we get:

\%\text{ yield of chromium (III) oxide}=\frac{402.4g}{434.72g}\times 100\\\\\% \text{yield of chromium (III) oxide}=\%

Hence, the theoretical yield and percent yield of chromium (III) oxide is 434.72 grams and 92.6 % respectively.

7 0
2 years ago
How do we determine the number of electrons in a neutral atom?
Elodia [21]

this is the answer of your question .

<em>Hope</em><em> </em><em>it</em><em> </em><em>helped </em><em>you</em>

3 0
2 years ago
Which of the following statements is true? Oceanic crust is thicker than continental crust. Both oceanic and continental crust i
zhuklara [117]
The crust is the thickest layer of the Earth.

3 0
3 years ago
To help relieve heartburn, a person should take medicine that is
Sav [38]

Prescribed to you by your doctor.

I would use an over the counter antacids for occasional heart burn. If there are symptoms of acid reflux I would suggest a histamine blocker, or H2-Blockers, such as Ranitidine (Zantac) and Famotidine (Pepcid)

3 0
3 years ago
Read 2 more answers
Other questions:
  • Create your own Model of an Atom. You may choose any element you would like to be represented by your model of an atom. Then pho
    14·1 answer
  • What type of chemical reaction is given by the following balanced equation: 2C8H18 + 25O2 → 16CO2 + 18H2O
    6·1 answer
  • The melting and boiling points of a substance are independent of
    8·2 answers
  • What are three physical factors that can be done to speed up a chemical reaction
    15·1 answer
  • Can rocks include organic materials, but minerals cannot true or false
    5·1 answer
  • Which statement best describes what a circle graph shows?
    10·2 answers
  • Is the boiling point of alcohol a physical or chemical change?
    7·1 answer
  • how does atomic radius change as you move down a group/family and as you move across a period/row on the periodic table? what ca
    8·1 answer
  • How many joules of heat are given off when 5.00g of water cool from 348.0K to 298.0K?
    6·1 answer
  • The combustion of hydrogen gas releases 286 kJ per mol of hydrogen. If 13.0 L of hydrogen at STP was burned to produce electrici
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!