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
gladu [14]
3 years ago
8

A sample of an unknown compound with a mass of 0.847 g has the following composition: 50.51 % fluorine and 49.49 % iron. When th

is compound is decomposed into its elements, what mass of each element would be recovered?
Chemistry
2 answers:
mars1129 [50]3 years ago
6 0

Answer:fluorine=0.5082

Iron=0.3388

Explanation:

Using Empirical formula to show the ratio.

F. Fe

50.51/39 49.49/56

=1.295. 0.88375

=1.295/0.88375 :0.88375/0.88375

=1.465:1

multiply each term by 2 to get a whole number ratio,we have

=(1.465*2) :(1*2)

=2.93:2

=3:2

To get the amount if each contribution of F and Fe,we use ratio,

F=3/(3+2)=3/5*total mass(0.847)

F=0.5082g

Similarly,Fe=2/5*0.847

Fe=0.3388g.

sergejj [24]3 years ago
4 0

Answer: 0,4278g of F and 0,4191g of Fe

Explanation: it's possible to calculate the mass of each element by multiplying the percentage (decimal) of the element by the mass of the compound.

For Fluorine (F)

0,847g * 0,5051 = 0,4278g of F

For iron (Fe)

0,847 * 0,4949 = 0,4191g of Fe

This is determined because even when the compound is decomposed, due to conservative law of mass, the decomposition process do not affect the amount of matter, so the mass of the elements remain even if they are separated from the original molecule.

At the end, the sum of the elements masses should be the total mass of the compound.

You might be interested in
Calculate the average atomic mass for element X
mina [271]

Answer:

51.6058

Explanation:

The percentage of abundance is changed to decimal by dividing 100

5 0
3 years ago
Which of these is NOT a unit of pressure<br><br> psi<br> atm<br> mm<br> Torr
Alexxx [7]
I think mm is not a unit of pressure
7 0
2 years ago
Suppose that a 10-mL sample of a solution is to be tested for I− ion by addition of 1 drop (0.2 mL) of 0.13 M Pb(NO3)2.
Liono4ka [1.6K]

The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

<u>Given data : </u>

Volume of solution to be tested for I-ion = 10 mL

Volume of  Pb(NO₃)₂ = 0.2 mL

molarity of Pb(NO₃)₂ = 0.13 M

<h3>Determine the number of I that must be present </h3>

First step : calculate conc of PB²⁺ ions in the solution

conc of PB²⁺ ions =  ( molarity of Pb(NO₃)₂ * volume of  Pb(NO₃)₂ ) / ( total volume )

                              = ( 0.13 * 0.2 ) / ( 10 + 0.2 )

                              = ( 0.026 ) / ( 10.2 )  = 0.002549 M

Next step :<u> </u><u>determine the</u><u> molarity of  I</u>

using the dissociation reaction of PbI₂

PbI₂(s) ---> Pb²⁺ (aq)  + 2I (aq)

also;  Ksp = [ Pb²⁺ ] [ I ]²  ---- ( 1 )

From the question the given value of Ksp = 8.49 * 10⁻⁹

Therefore equation ( 1 ) becomes

8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²

[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )

      = 0.0018 M

Final step :<u> Determine the minimum number of grams of I </u>

moles of I = molarity of I * total volume

                 = 0.0018 M * 10.2 mL

                 = 0.01836 * 10⁻³ mol

Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Learn more about Pb(NO₃)₂ : brainly.com/question/25071409

8 0
2 years ago
Read the Casestudy Conservation Planning and summarize it - 5 sentence minimum.
Fittoniya [83]

Answer:

Developing Conservation Case Studies for Decision-making ... titled “Producer Experiences” or “Case Studies” for use in future planning efforts and ... convince a producer of the benefits of conservation, or at least help them understand the ... Easy to read, especially for those that are not comfortable with economics or data​.

3 0
2 years ago
Help ASAP!!! I need it now i have to write similar test tmrw
dusya [7]
A is Ea, which stands for activating energy. Energy is needed to get the reaction underway and Ea is the energy needed to “start” the reaction.

B is the temperature either released or absorbed.

The diagram shows that the reaction is exothermic based on the fact that the products energy is lower than the reactants. That is because energy (which is temperature in this case) is released during the process. If the reactants would have been lower than the products, the reaction would be endothermic.
3 0
2 years ago
Read 2 more answers
Other questions:
  • Calculate the percent dissociation of trimethylacetic acid(C6H5CO2H) in a aqueous solution of the stuff.
    15·1 answer
  • A 12.00 g milk chocolate bar is found to contain 8.000 g of sugar. What will be the amount of sugar in milligrams if the size of
    12·2 answers
  • The heat energy required to change a unit mass of a solid into a liquid at constant temperature is called
    6·2 answers
  • If a current-carrying wire is in a magnetic field, in what direction will a force be exerted on the wire?
    12·2 answers
  • Con has a blue-gray color.
    14·1 answer
  • How many moles of Na2CO3 are in 100.0ml of a 2.0M solution?
    11·1 answer
  • We use less than 1% of the water on Earth for
    12·2 answers
  • How many grams of a 19.6% sugar solution contain 72.5 g of sugar?
    10·1 answer
  • Need help with this.
    8·2 answers
  • 2) Imagine that a loudspeaker is producing quiet note with a low pitch
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!