CHEMISTRY HIGH SCHOOL

Find K for this redox reaction when E = -2.12 V: Zn2+ + 2Cl- → Zn + Cl2.

Answers

Answer 1
Answer:

Answer:

K = 2 × 10⁻⁷²

Explanation:

Step 1. Determine the value of n

Zn²⁺ + 2e⁻ → Zn

2Cl⁻ → Cl₂+ 2e⁻          

Zn²⁺ + 2Cl⁻ → Zn + Cl₂; E = -2.12 V

n = 2 mol electrons

===============

Step 2. Calculate K

The formula relating E and K is

E = (RT)/(nF)lnK

E = -2.12 V

R = 8.314 J·K⁻¹mol⁻¹

T = 298.15 K

n = 2

F = 96 485 C/mol

-2.12 = (8.314 × 298.15)/(2 × 96 485)lnK     Do the multiplications

-2.12 = 2479/192 970 lnK     Do the division

-2.12 = 0.012 85 lnK             Divide both sides by 0.012 85 and transpose

ln K = -165.0                          Take the antilog of both sides

K = e^(-165.0)

K = 2 × 10⁻⁷²

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The three conditions that encourage the presence of marine life in the ocean are proximity to land, water depth and ___________.A.) exposure to sunlight

B.) exposure to seasonal changes

C.) exposure to human activity

D.) exposure to moonlight

Answers

he three conditions that encourage the presence of marine life in the ocean are proximity to land, water depth and exposure to sunlight.

Exposure to sunlight is important since sunlight promotes the metabolic activities of algae. If we look at the food pyramid for the aquatic ecosystem, the algae is in the lowest and therefore is basic necessity. 

How to turn any drink into a gummy

Answers

add gelatin and let it boil, then put it in the freezer for 30 minuets

In 1909, Ernest Rutherford shot tiny particles at a sheet of gold foil. He expected all of the particles to move straight through the gold's atoms. Instead, some of the particles moved through, but other particles bounced back. What conclusion did Rutherford draw from these results?A. An atom is a soft blob of material composed of a mixture of protons and electrons.

B. An atom is entirely solid and has no empty spaces between its particles.

C. An atom has a dense nucleus surrounded by mostly empty space where electrons travel.

Answers

Option C: an atom has a dense nucleus sorrounded by mostly empty space where electrons travel.

Maki uses 20 gallons of a solution with an unknown ethanol concentration and 60 gallons of a 12% ethanol solution to make 80 gallons of a 10% solution. What is the value of x, the concentration of the unknown ethanol solution?. a. 0.02.
b. 0.04.
c. 0.05.
d. 0.08

Answers

This question is based on the concept of percentage by mass. Therefore the value of x, concentration of unknown ethanol solution is 4% when 20 gallons of a known solution is used. Option b is correct option

What is percentage by mass?

Mass percentage represents the the percentage of each element that is making a particular compound. Mass percentage does not have any unit as numerator and denominator contains the same unit.

Mathematically,

Percentage of mass = (component’s mass ÷ total mass) x 100%

According to the question the equation can be written as:

20× (x÷ 100) + 60×0.12 = 80× 0.10

x÷5 + 7.2 = 8

x÷ 5 = 0.8

x = 4%

concentration of unknown solution = 4%

Therefore, the value of x, concentration of unknown ethanol solution is 4% when 20 gallons of a solution is used. Option b is correct option

To learn more about mass percentage, here:

brainly.com/question/27429978

#SPJ5

the correct answer is B

The standard on which the atomic mass unit is based is the mass of a (1 point)proton. neutron. chlorine-35 atom. carbon-12 atom.

Answers

D. carbon-12 atom I hope this helps :)

Carbon-12 Atom is correct :)

A neutral atom of iron has a mass number of 56 and an atomic number of 26. How many protons, electrons and neutrons are in this atom? Explain how you determine each number.

Answers

so here its given ..
mass no. = 56
and atomic no. = 26

=> in an atom there is an equal number of electrons and protons ...(e=p)..
=> also atomic number is the number of the electrons or protons ..
=> so here we got the no. of electrons and protons ..which is 26 ..
=> to find the number of neutrons in an atom , subtract atomic number from the mass number..i.e, 56 - 26 = 30 ...

=> so  there are 26 electrons , 26 protons and 30 neutrons in the given atom ...

Hope it helps !!!
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