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
kramer
3 years ago
5

Dolomite is a mixed carbonate of calcium and magnesium that decomposes to CO2 and the metal oxides MgO and CaO upon heating. Whe

n 15.42 g of dolomite is heated, 7.85 g of MgO and CaO are produced. What is percent by mass of MgCO3 in the original sample of dolomite?
Chemistry
1 answer:
kirill [66]3 years ago
7 0

Answer:

47%

Explanation:

MgCO₃ (s) → MgO (s) + CO₂ (g)

CaCO₃ (s) → CaO (s) + CO₂ (g)

_______________________

MgCO₃ (s) + CaCO₃ (s) → MgO (s) + CaO (s) + 2CO₂ (g)

MgO: 40.3044 g/mol

MgCO₃: 84.3139 g/mol

CaO:56.0774 g/mol

CaCO₃: 100.0869 g/mol

CO₂: 44.01 g/mol

15.42 g is the total mass of dolomite.

7.85 g is the sum of MgO and CaO produced.

This means that 7.57 g of CO₂ were produced.

44.01 g CO₂_____ 1 mol

7.57 g CO₂ _____  x

x = 0.172 mol CO₂

Considering the global reaction, we had 0.172/2 = 0.086 mol of MgCO₃ in the original sample.

1 mol MgCO₃ _______ 84.3139 g

0.086 mol MgCO₃ ___ y

y = 7.25 g

15.42 g dolomite ______ 100%

7.25 g MgCO₃ ________ z

z = 47%

You might be interested in
Create an element card that has the following information:
Shtirlitz [24]

Answer:

Atomic number:6

Atomic mass:12.011

Chemical symbol:C

Name of element: Carbon, Carbone (french)

Image is in my explanation

Explanation:

6 0
3 years ago
A compound ‘X’ is used for drinking, has pH =7.Its acidified solution undergoes decomposition in presence of electricity to prod
umka21 [38]

Answer:

X = Water (H2O) ; Y = Hydrogen ; Z = Oxygen

Explanation:

2(H2O) -------> 2H2 + O2

6 0
2 years ago
If an insect population increases and then decreases as the available supply of food changes, what does this demonstrate
Semenov [28]
D.

This is self-regulation because when the population of the insects becomes too large, it regulates itself and starts to decrease due to a shortage of resources.
7 0
3 years ago
What is meant by the term sensitivity in Analytical Chemistry? (a) The term refers to the limit at which the absorption instrume
ivolga24 [154]

The term sensitivity in Analytical Chemistry is "the slope of the calibration curve or a function of analyte concentration or amount".

<u>Answer:</u> Option B

<u>Explanation:</u>

In a sample, the little amounts of substances can be accurately evaluated by a method is termed as "Analytical sensitivity". This detect a target analyte like an antibody or antigen, process is considered as potential of a test to and generally demonstrated as the analyte's minimum detectable concentration.

The acceptable diagnostic sensitivity is not guaranteed by high analytical sensitivity. The percentage of individuals who have a given disarray who are identified by the method as positive for the disarray is known as "Diagnostic sensitivity".

6 0
3 years ago
Which option is an example of physical change?
Murljashka [212]

Answer:

They are all physical exept c

Explanation:

8 0
2 years ago
Read 2 more answers
Other questions:
  • What is the basic unit of all matter?What is the basic unit of all matter?
    13·2 answers
  • What was helium used for in the past?
    12·2 answers
  • Calcum chloride contains only calcum and chloride What is the fomula for this compound? fou need the Peodie Table for thia quest
    8·1 answer
  • Which statement Is true of chloroplasts? A. They transport glucose into the cell. B. They convert light energy into chemical ene
    9·2 answers
  • you measure the depth to the bottom with a lead line and find out the bottom is 6000 meters deep. How many seconds would it take
    15·1 answer
  • The purpose of an indicator is to A. test and determine the pH values of unknown solutions. B. help acids and bases dissociate w
    14·2 answers
  • One canned juice drink is 15% orange juice; another is 5% orange juice. How many liters of each should be mixed together in orde
    10·1 answer
  • What is the amplitude of the wave above? *
    6·1 answer
  • 8. Why would it be a bad idea to make coins made of sodium metal?
    6·1 answer
  • How many formula units of silver fluoride, AgF, are equal to 42.15 g of this substance?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!