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Ivenika [448]
3 years ago
14

Plzzzzz help me answer this question (WILL AWARD BRAINLIEST)

Chemistry
1 answer:
Greeley [361]3 years ago
5 0
The correct answer is b
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Calculate the cell potential at 25oC under the following nonstandard conditions: 2MnO4-(aq) + 3Cu(s) + 8H+(aq) ⟶ 2MnO2(s) + 3Cu2
baherus [9]

Answer:

1.346 v

Explanation:

1) Fist of all we need to calculate the standard cell potential, one should look up the reduction potentials for the species envolved:

(oxidation) Cu_{(s)} →Cu^{2+}_{(aq)} +2e E°=0.337 v

(reduction) MnO_{4 (aq)} + 3e + 4H^{+}_{(aq)}→MnO_{2 (aq)}+2H_{2}O E°=1.679 v

(overall) 2MnO_{4 (aq)}+3Cu_{(s)}+8H^{+}_{(aq)}→3Cu^{2+}_{(aq)}+2MnO_{2 (aq)}+4H_{2}O E°=1.342 v

2) Nernst Equation

Knowing the standard potential, one calculates the nonstandard potential using the Nernst Equation:

E=E^{0} -\frac{RT}{nF}Ln\frac{[red]}{[ox]}

Where 'R' is the molar gas constant, 'T' is the kelvin temperature, 'n' is the number of electrons involved in the reaction and 'F' is the faraday constant.

The problem gives the [red]=0.66M and [ox]=1.69M, just apply to the Nernst Equation to give

E=1.342 -\frac{298.15*8.314}{6*96500}Ln\frac{[.66]}{[1.69]}=1.346

E=1.346

5 0
3 years ago
How many 2-tablespoon doses are in 4 bottles of medication containing 16 ounces each?
Dima020 [189]

1 tablespoon = 0.5 ounces

We are required to find for 2 table spoons.

2 table spoons = 2 x 0.5 = 1 ounce.

Each bottle has 16 ounce.

Number of bottles = 4

So total number = 4 x 16 = 64 ounces.

Number of 2 table spoons = \frac{64 ounce}{1 ounce}

= 64

Thus there are 64 2-tablespoon doses are in 4 bottles of medication containing 16 ounces each.

8 0
3 years ago
Fast pls..,.,,..,,.,.,.
OLga [1]
I believe the answer is gills

Fish's use gills to breathe, so tadpoles should use gills too

hope this helps

(got the info from a documentary i watched a couple years ago)
4 0
3 years ago
Read 2 more answers
What is the simplest formula of a compound if a sample of the compound contains 0.221 mol X, 0.442 mol Y, and 0.884 mol Z? chemP
Gnoma [55]

Answer:

XY₂Z₄

2.35 mol Z

Explanation:

A sample of the compound contains 0.221 mol X, 0.442 mol Y, and 0.884 mol Z. We can find the simplest formula (empirical formula) by <em>dividing all the numbers of moles by the smallest one</em>.

X: 0.221/0.221 = 1

Y: 0.442/0.221 = 2

Z: 0.884/0.221 = 4

The simplest formula is XY₂Z₄.

The molar ratio of X to Z is 1:4. The moles of Z in a sample that contained 0.588 moles of X is:

0.588 mol X × (4 mol Z/1 mol X) = 2.35 mol Z

6 0
3 years ago
Read 2 more answers
Recently, the United States government decided to construct a huge crypt in the middle of Yucca Mountain in Nevada to bury high-
Anton [14]
The three concerns that the residents of this area might be:

1) <span>The cost of not moving forward is extremely high, so they opposed the plan, as they think it would affect US economy

2) </span><span>Nuclear waste disposal capability is an environmental imperative, so their environment would be polluted by very radioactive materials.

3) </span>Demand for new nuclear plants also demands disposal capability which supports national security but again, their site will be no longer for them. But unfortunately, <span>Extensive studies consistently show Yucca Mountain to be a sound site for nuclear waste disposal so the plan can't be abolished.

Hope this helps!</span>
4 0
3 years ago
Read 2 more answers
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