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
Allushta [10]
3 years ago
9

How many milliliters of 0.200 m fecl3 are needed to react with an excess of na2s to produce 1.38 g of fe2s3 if the percent yield

for the reaction is 65.0%? 3 na2s(aq) + 2 fecl3(aq) → fe2s3(s) + 6 nacl(aq)?
Chemistry
2 answers:
baherus [9]3 years ago
6 0

<u>Answer:</u> The volume of ferric chloride needed is 102 mL

<u>Explanation:</u>

To calculate the theoretical yield of ferric sulfide, we use the equation:

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

Experimental yield of ferric sulfide = 1.38 g

Percentage yield of ferric sulfide = 65.0 %

Putting values in above equation, we get:

65.0=\frac{1.38g}{\text{Theoretical yield of ferric sulfide}}\times 100\\\\\text{Theoretical yield of ferric sulfide}=\frac{1.38}{65}\times 100=2.12g

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

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of ferric sulfide = 2.12 g

Molar mass of ferric sulfide = 208 g/mol

Putting values in above equation, we get:

\text{Moles of ferric sulfide}=\frac{2.12g}{208g/mol}=0.0102mol

The given chemical equation follows:

3Na_2S(aq.)+2FeCl_3(aq.)\rightarrow Fe_2S_3(s)+6NaCl(aq.)

By Stoichiometry of the reaction:

1 mole of ferric sulfide is produced from 2 moles of ferric chloride

So, 0.0102 moles of ferric sulfide will be produced from \frac{2}{1}\times 0.0102=0.0204mol of ferric chloride

  • To calculate the volume for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}

Molarity of ferric chloride = 0.200 M

Moles of ferric chloride = 0.0204 moles

Putting values in above equation, we get:

0.200M=\frac{0.0204\times 1000}{\text{Volume of ferric chloride}}\\\\\text{Volume of ferric chloride}=\frac{0.0204\times 1000}{0.200}=102mL

Hence, the volume of ferric chloride needed is 102 mL

ahrayia [7]3 years ago
3 0
<span>Answer: 100 ml
</span>

<span>Explanation:


1) Convert 1.38 g of Fe₂S₃ into number of moles, n


</span>i) Formula: n = mass in grass / molar mass
<span>
ii) molar mass of </span><span>Fe₂S₃ =2 x 55.8 g/mol + 3 x 32.1 g/mol = 207.9 g/mol
</span>

iii) n = 1.38 g / 207.9 g/mol = 0.00664 moles of <span>Fe₂S₃
</span>

<span>2) Use the percent yield to calculate the theoretical amount:
</span>

<span>65% = 0.65 = actual yield/ theoretical yield =>


</span>theoretical yield = actual yield / 0.65 = 0.00664 moles / 0.65 = 0.010 mol <span>Fe₂S₃</span><span>

3) Chemical equation:
</span>

<span> 3 Na₂S(aq) + 2 FeCl₃(aq) → Fe₂S₃(s) + 6 NaCl(aq)


4) Stoichiometrical mole ratios:
</span>

<span>3 mol Na₂S : 2 mol FeCl₃ : 1 mol Fe₂S₃ : 6 mol NaCl


5) Proportionality:


</span>2moles FeCl₃ / 1 mol Fe₂S₃ = x / 0.010 mol Fe₂S₃
<span>
=> x = 0.020 mol FeCl₃


6) convert 0.020 mol to volume
</span>

<span>i) Molarity formula: M = n / V
</span>

<span>ii) V = n / M = 0.020 mol / 0.2 M = 0.1 liter = 100 ml
</span>

You might be interested in
Esters are generally pleasant smelling compounds<br>True<br>False​
Rzqust [24]

Answer:

True

Explanation:

Esters are generally pleasantly smelling compounds. In fact, the fragrance industry uses esters to produce perfume, as well as uses esters as an ingredient to produce synthetic flavours and cosmetics, all of which have unique and pleasant smells.

8 0
3 years ago
Describe the type of force which exists between particles in an Ideal gas. Explain why this type of force exists between the par
aksik [14]

The Intermolecular force is a type of force which exists between particles in an Ideal gas.

<h3>What  type of force which exists between particles in an Ideal gas?</h3>

Intermolecular forces are considered weaker attractions that hold molecules in gas close together. This force of attraction is present between molecules or particles.

So we can conclude that the Intermolecular force is a type of force which exists between particles in an Ideal gas.

Learn more about attraction here: brainly.com/question/1308963

#SPJ1

8 0
1 year ago
Robert has 4 grams of a substance and Jill has 10 grams of the same substance. Which of the following statements is true?
ELEN [110]
If Robert has 4 grams of a substance and Jill has 10 grams of the same substance <span>Jill's sample will weigh more than Robert's sample.</span>
5 0
3 years ago
Read 2 more answers
The right line is a 90° clockwise rotation of the left line about the origin. Click the 90° clockwise button. Are these lines th
inessss [21]

Answer:

Switch the coordinates and change the sign of the second one by multiplying it by negative 1.

Explanation:

Here are some examples and a more general way to understand the problem.

Consider the point (1,1), a 90 degree rotation clockwise about the origin would move it into the 4th quadrant.

The new point is (1,-1) , similarly (-4,2)-> (2,4), (-4,3)-> (3,4)

We take a point p= (x,y) the the result of rotation p 90 clockwise about the orgin is a new point p'=(x',y')= (-y, x). .

In the case of p=(1,0) the new point is p'= (0, -1)

One can use a matrix where the first row is cos(a), sin(a) and the second row is

-sin(a) cos(a) for any clockwise rotation of a degrees about the origin.

If we let a=90 degrees we have

[0 1] as the first row and [-1 0] as the second row. So the matrix is:

|0 1|

|-1 0|

Call that matrix M

So a point p= (x,y) can be multiplied by M as follows Mp=p' where p' is the rotated point.

If p=(-4,2) then Mp

is M(-4,2) which after matrix multiplication means x'=0*-4+1*2=2 and y'=-1*-4+0*2=4

So p'=(2,4)

Try it with (1,0)

x'=1*0+0*1=0

y'=-1*1+0*1=-1

so p'=(0,-1) and (1,0)->(0,-1)

How about the point on the y axis (0,1), it should go to the point (1,0)

0*1+1*1=1 and -1*0+0*1 gives you the pont (1,0) ( we don't see the negative sign because -0 is just 0)

7 0
3 years ago
How can there be more than 1000 different atoms when there are only about 100 different elements?
Irina-Kira [14]
Um im pretty sure there are only about 100 different atoms...
7 0
2 years ago
Other questions:
  • The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release
    7·2 answers
  • Calculate the mass of MgCO3 precipitated by mixing 10.00 mL of a 0.200 M Na2CO3 solution with 5.00 mL of a 0.0450 M Mg(NO3)2 sol
    8·1 answer
  • How many valence electrons does K+ have
    14·2 answers
  • Dr. Hakoda is studying tsunamis—large waves that can reach heights of 1,700 feet. Tsunamis are often caused when large chunks of
    8·2 answers
  • 33 grams of NH4NO3 will produce how many grams of water
    9·1 answer
  • What is the pH of a 1.9 M solution of HClO4?
    14·1 answer
  • What are all of the elements that end with F electrons
    12·1 answer
  • Based on its location on the periodic table, which element(s) have properties similar to N? Choose all that apply. *
    6·1 answer
  • An electron moves from an excited state back to the ground state releasing
    14·1 answer
  • In which situation might a forensic scientist decide to collect fiber evidence from a crime scene?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!