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
Gennadij [26K]
3 years ago
15

3.47 g of the hydrated "double salt", ammonium iron (II) sulfate hexahydrate, FeSO4(NH4)2SO4*6H2O was dissolved in 200. mL of wa

ter. 20.0 mL of the solution had some acid added to it and then it reacted completely with 12.6 mL of KMnO4 solution. Calculate the concentration of the KMnO4 solution given the full REDOX equation below.
5Fe2+ + MnO4- + 8H+ --> 5Fe3+ +Mn2+ + 4H2O
Chemistry
1 answer:
Ostrovityanka [42]3 years ago
7 0

Answer:

1.4 × 10^-4 M

Explanation:

The balanced redox reaction equation is shown below;

5Fe2+ + MnO4- + 8H+ --> 5Fe3+ +Mn2+ + 4H2O

Molar mass of FeSO4(NH4)2SO4*6H2O = 392 g/mol

Number of moles Fe^2+ in FeSO4(NH4)2SO4*6H2O = 3.47g/392g/mol = 8.85 × 10^-5 moles

Concentration of Fe^2+ = 8.85 × 10^-5 moles × 1000/200 = 4.425 × 10^-4 M

Let CA be concentration of Fe^2+ = 4.425 × 10^-4 M

Volume of Fe^2+ (VA)= 20.0 ml

Let the concentration of MnO4^- be CB (the unknown)

Volume of the MnO4^- (VB) = 12.6 ml

Let the number of moles of Fe^2+ be NA= 5 moles

Let the number of moles of MnO4^- be NB = 1 mole

From;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CB= CAVANB/VBNA

CB= 4.425 × 10^-4 × 20 × 1/12.6 × 5

CB = 1.4 × 10^-4 M

You might be interested in
An ionic bond is a bond that forms between..<br><br> help
JulsSmile [24]

Answer:

ions with opposite charge

Explanation:

ionic bond is formed between oppositely charged ions in a chemical compound.

5 0
3 years ago
Read 2 more answers
Organized information is easier to use. Which of the following explains how information about elements and their atoms is organi
strojnjashka [21]
D the periodic table shows the elements and their atoms and how they are arranged
7 0
3 years ago
If a mouse eats grass, a snake eats the mouse, and an owl eats the snake, the owl is considered the (4 points)
castortr0y [4]
Im pretty sure it would be a primary consumer because Primary consumers are animals that eat primary producers aka herbivores (plant-eaters). Secondary consumers eat primary consumers aka carnivores (meat-eaters) and omnivores (animals that eat both animals and plants). Tertiary consumers eat secondary consumers.
7 0
4 years ago
Read 2 more answers
Según la Organización Mundial de la Salud, el nitrato de plata ( densidad = 4.35 g/cc ) es una sustancia con propiedades cáustic
OlgaM077 [116]

Answer:

737.52 mL de agua

Explanation:

En este caso solo debes usar la expresión de molaridad de una solución la cual es:

M = moles / V

Donde:

V: Volumen de solución.

Como queremos saber la cantidad de agua, queremos saber en otras palabras cual es la cantidad de solvente que se utilizó para preparar los 800 mL de disolución.

Una disolución se prepara con un soluto y solvente. El soluto lo tenemos, que es el nitrato de plata. Con la expresión de arriba, calculamos los moles de soluto, y luego su masa. Posteriormente, calculamos el volumen con la densidad, y finalmente podremos calcular el solvente de esta forma:

V ste = Vsol - Vsto

Primero calcularemos los moles de soluto:

moles = M * V

moles = 2 * 0.800 = 1.6 moles

Con estos moles, se calcula la masa usando el peso molecular reportado que es 169.87 g/mol:

m = moles * PM

m = 1.6 * 169.87 = 271.792 g

Ahora usando el valor de la densidad, calcularemos el volumen de soluto empleado:

d = m/V

V = m/d

V = 271.792 / 4.35

V = 62.48 mL

Finalmente, la cantidad de agua necesaria es:

V agua = 800 - 62.48

V agua = 737.52 mL

8 0
3 years ago
How many moles Of H2O will be produced from 42.0 g of H2O2?
d1i1m1o1n [39]
Molar{Mass} H_{2}O_{2} =2*16.0+2*1.0= 34.0 g/mol&#10;&#10;42.0 g H_{2}O_{2}* \frac{1 mol H_{2}O_{2}}{34.0 g H_{2}O_{2}} = 1.24 mol H_{2}O_{2}&#10;&#10;2H_{2}O_{2} --\ \textgreater \ 2 H_{2}O +O_{2}&#10;\\2 mol  ----2 mol   (from// reaction)&#10;&#10;\\1.24 mol ---1.24 mol (from  the problem)&#10;&#10;Answer: 1.24 mol H_{2}O.
3 0
3 years ago
Other questions:
  • When did the baby boom take place in the united states
    14·2 answers
  • Which of the following is not an effective way to manage forests and trees?
    7·2 answers
  • A student prepares a solution by dissolving 1.000 mol of Na2SO4 in water. She accidentally leaves the container uncovered and co
    15·1 answer
  • If the heat of reaction is negative, the reaction is _____. Select one:
    11·2 answers
  • Liquids that mix completly are called
    9·2 answers
  • A 780.0 g hard-water sample contains 276 mg Ca. What is the concentration in parts per million?
    9·1 answer
  • ANSWER ASAP Please! How do groups and periods differ? What trend specifically occurs in either?
    9·1 answer
  • What are the effects of to much nitrogen in the water?
    11·1 answer
  • What is mole in chemistry?
    12·2 answers
  • How much 10,000J will raise the temperature of 1 liter of water in C
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!