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Mila [183]
3 years ago
13

What is urine made of?

Chemistry
1 answer:
Annette [7]3 years ago
6 0

Answer: 90 percent water,  electrolytes such as potassium and phosphorus, and chemicals called urea and uric acid

Explanation:

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What is the calculated value of the cell potential at 298K for an
Tpy6a [65]

The question is incomplete, here is the complete question:

What is the calculated value of the cell potential at 298 K for an  electrochemical cell with the following reaction, when the H₂  pressure is 6.56 x 10⁻² atm, the H⁺ concentration is 1.39 M, and  the Sn²⁺ concentration is 9.35 x 10⁻⁴ M?

2H^+(aq)+Sn(s)\rightarrow H_2(g)+Sn^{2+}(aq)

<u>Answer:</u> The cell potential of the given electrochemical cell is 0.273 V

<u>Explanation:</u>

For the given chemical equation:

2H^+(aq)+Sn(s)\rightarrow H_2(g)+Sn^{2+}(aq)

The half cell reactions for the given equation follows:

<u>Oxidation half reaction:</u> Sn(s)\rightarrow Sn^{2+}(aq)+2e^-;E^o_{Sn^{2+}/Sn}=-0.14V

<u>Reduction half reaction:</u> H_2+2e^-\rightarrow H_2(g);E^o_{2H^{+}/H_2}=0.0V

Oxidation reaction occurs at anode and reduction reaction occurs at cathode.

To calculate the E^o_{cell} of the reaction, we use the equation:

E^o_{cell}=E^o_{cathode}-E^o_{anode}

Putting values in above equation, we get:

E^o_{cell}=0.0-(-0.14)=0.14V

To calculate the EMF of the cell, we use the Nernst equation, which is:

E_{cell}=E^o_{cell}-\frac{0.059}{n}\log \frac{[Sn^{2+}]\times p_{H_2}}{[H^+]^2}

where,

E_{cell} = electrode potential of the cell = ?

E^o_{cell} = standard electrode potential of the cell = +0.14 V

n = number of electrons exchanged = 2

[H^{+}]=1.39M

[Sn^{2+}]=9.35\times 10^{-4}M

p_{H_2}=6.56\times 10^{-2}atm

Putting values in above equation, we get:

E_{cell}=0.14-\frac{0.059}{2}\times \log(\frac{(9.35\times 10^{-4})\times (6.56\times 10^{-2})}{(1.39)^2})\\\\E_{cell}=0.273V

Hence, the cell potential of the given electrochemical cell is 0.273 V

4 0
3 years ago
Could you help answer these two question
Katen [24]

Answer:

number 29 is D

Explanation: When the moon orbits the earth some of the light reflects off the moon, making it visible on the Earth.

I dont know how to answer 28 fully, is there a picture?

4 0
3 years ago
A sample of oxygen has a volume of 7.84 mL at a pressure of 71.8 mmHg and a
Andru [333]

here is an attached photo with a detailed explanation, good luck!

4 0
3 years ago
Which of the following correctly describes one way that photosynthetic plants are involved in the carbon cycle? Choose 1 answer:
brilliants [131]

Answer:

The correct answer is - (Choice A) A Photosynthetic plants can move carbon from the atmosphere into an ecosystem’s food web.

Explanation:

Photosynthesis is the process performed by photosynthetic or green plants in presence of light atmospheric carbon dioxide and water converted into glucose (6 carbon compound) and oxygen.

This glucose or sugar is utilized by the plants that are producers in the ecosystem food web. These producers are fed by consumers and carbon molecules transfer from all the trophic levels in the food chain or food web in the process.

7 0
3 years ago
If 6.02×1023 atoms of element Y have a mass of 28.09 g, what is the identity of Y?
Mazyrski [523]

Silicon is the element having a mass of 28.09 g

<u>Explanation</u>:

  • Silicon is the element having an atomic mass of 28.09 g / mol. So 28.09 g of silicon contains 6.023 \times 10^23 atoms. One mole of each element can produce one mole of compound.
  • The Atomic weight of an element can be determined by the number of protons and neutrons present in one atom of that element. So atomic weight expressed in grams always contain the same number of atoms( 6.023 \times10^23).
  • Avagadro number is the number of atoms of 1 mole of any gas at standard temperature and pressure. It has been determined that 6.023 \times 10^23 atoms of an element are equal to the average atomic mass of that element.
8 0
3 years ago
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