I believe the correct answer is option B. Molarity is the <span>number of moles of solute that is dissolved in 1 liter of solution. It is another way of expressing concentration of a mixture especially for solutions. Percent by mass is grams solute per grams of solution. Percent by volume is liter solute per liter per solution.</span>
Answer:
C is the correct answer
Explanation:
to test for the presence of carbonate minerals in a rock
The current needed to deposit all of the nickel in 5 hours is 2.219 A
<h3>
What is Faraday's Law of electrolysis?</h3>
According to the first law of Faraday, the amount of substance liberated at an electrode is directly proportional to the quantity of charge passed through an electrolyte.
m = zq , where z = electrochemical equivalent
An electrochemical equivalent is the mass of the substance liberated at an electrode when 1 Columb of charge is passed through the electrolyte.
For the nickel,
![Ni^{2+} (aq) + 2e^- \rightarrow Ni (s)](https://tex.z-dn.net/?f=Ni%5E%7B2%2B%7D%20%28aq%29%20%2B%202e%5E-%20%5Crightarrow%20Ni%20%28s%29)
z = 2
The molar mass of NiS0₄ = 154.75 g
154.75 g of Ni needs 2 x 96485 C
32 g of Ni needs ![\frac{2\times 96485\times 32}{154.75} \\](https://tex.z-dn.net/?f=%5Cfrac%7B2%5Ctimes%2096485%5Ctimes%2032%7D%7B154.75%7D%20%5C%5C)
32 g of Ni needs 39944.79 C
We know,
q = It
Where q = charge
I = current and t = time in seconds
q = 39944.79 C and t = 5 x 60 x 60 = 18000 s
![I = \frac{q}{t} \\ = \frac{39944.79}{18000}](https://tex.z-dn.net/?f=I%20%3D%20%5Cfrac%7Bq%7D%7Bt%7D%20%5C%5C%20%20%20%20%20%3D%20%5Cfrac%7B39944.79%7D%7B18000%7D)
= 2.219 A
Hence, the current needed to deposit all the nickel is 2.219 A in 5 hours
Learn more about Faraday's law of electrolysis:
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Spanish System is not the name of a measurement system
WHAT IS MEASUREMENT SYSTEM?
- Measurement system are standard systems that are made up of collection is of units of measurement and guiding rules.
- Measurement system relates numerical values to physical quantities. There are three major system of measurements in use, they are:
- The international system of units (S.I units)
- The British imperial system
Hence, Spanish System is not one of the names of measurement of systems.
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