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charle [14.2K]
3 years ago
9

Given the balanced equation representing a reaction occurring in an electrolytic cell:

Chemistry
2 answers:
Kisachek [45]3 years ago
6 0

Answer : The correct option is, (4) at the cathode, where reduction occurs

Explanation :

Electrolytic cell : It is the cell in which the chemical reaction occurs by passing of the current from external source.

In this electrolytic cell, the oxidation occurs at anode that is a positive electrode and reduction occurs at cathode that is a negative electrode.

The given balanced chemical reaction is,

2NaCl(l)\rightarrow 2Na(l)+Cl_2(g)

On passing electricity in the molten NaCl, Na and chlorine gas are obtained at cathode and anode respectively.

The half-cell reaction are :

At cathode : 2Na^+2e^-\rightarrow 2Na    (Reduction)

At anode : 2Cl^-\rightarrow Cl_2+2e^-    (Oxidation)

Hence, from this we conclude that, Na(l) produced in the cell at the cathode, where reduction occurs.

Vikki [24]3 years ago
4 0
The answer is (4) at the cathode, where reduction occurs. The Na+ gains one electron and become Na(l). So the reaction occurs at cathode and is reduction reaction.
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Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%?
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Reaction equation:
Zn + 2HCl → ZnCl₂ + H₂

One mole of gas occupies 22.4 L at STP
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= 5 moles

The theoretical amount of Zn needed is 5 mol
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3 years ago
How many moles are in 1.9 x 1046 atoms of chromium?
faust18 [17]

Answer:

<h2>3.156 × 10²² atoms</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{1.9 \times  {10}^{46} }{6.02 \times  {10}^{23} }  \\  = 3.156 \times  {10}^{22}

We have the final answer as

<h3>3.156 × 10²² atoms</h3>

Hope this helps you

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