Answer:
The overall cell potential must be positive.
Explanation:
What must be true for a spontaneous reaction in an electrochemical cell?
- The overall cell potential must be positive. YES. This is by convention.
- The overall cell potential must be negative. NO. By convention, a negative cell potential means the cell is not spontaneous.
- The cathode’s standard reduction potential must be positive. NO. It only has to be higher than the anode's standard reduction potential.
- The cathode’s standard reduction potential must be negative. NO. It only has to be higher than the anode's standard reduction potential.
The Mass of ice is 69.12g.
What is mass?
It is a dimensionless quantity that expresses a particle or object's mass. The accepted unit of mass under the International System (SI) is the kilogram.
What is temperature?
Temperature is a measure of the average kinetic energy of the particles inside an object. The temperature increases cause these particles to move more quickly. It is possible to measure temperature using a thermometer or a calorimeter.
first calculate the amount of heat as follows;
q= mass of water C= (0°C-55°C)
=100.0g (4.186J/g°c) (-55°C)
=-23023J
Heat lost by water is gained by ice,
-q=m*ΔH
-23023J= m*333J/g
= 69.12g
Therefore, Mass of ice is 69.12g.
Learn more about mass from the given link.
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An image is attached depicting the Lewis structure of HClO with the atoms arranged in that order. The result is a single bond between each atom. We can calculate the formal charge of each atom with the following formula:
Formal charge = (Valence electrons) - (electrons shared in bonds) - (non-bonded electrons)
H: Formal charge = 1 - 1 - 0 = 0
Cl: Formal charge = 7 - 2 - 4 = +1
O: Formal charge = 6 - 1 - 6 = -1
This structure is not the actual way these atoms arrange. The atoms will actually arrange in the order of H-O-Cl to form hypochlorous acid with a single bond between the three atoms and formal charges of 0 on each atom.
Answer:
2.4 %
Explanation:
.15 mole * ( 23 + 16 + 1) gm / mole = 6 gm in solution
250 cm^3 of water solvent weighs 250 gm
6 gm / 250 gm = 2.4 %