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3 years ago

How many protons are there in 20.02 mol of neon (Ne)?

1 answer:

7 0

In order to determine the number of protons in 20.02 mol of Ne, we use Avogadro's number to convert the number of moles to number of atoms, 1 mol = 6.022 x 10^23 atoms. From there, we must know the number of protons in a Neon atom, which is 10. Thus, the formula will be:
(20.02 mol Ne)x(6.022 x 10^23 atoms/mol)x(10 protons/1 atom Ne) = 1.2056 x 10^26 protons

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Is it possible for the entropy of both a closed system and its surroundings to decrease during the process?

iren [92.7K]

Only when heat is transferred from the system to its surroundings does a closed system suffer a decrease in entropy.

Only when heat is transferred from the system to its surroundings does a closed system suffer a decrease in entropy. Every internally reversible operation in a closed system generates entropy. Entropy remains constant in an adiabatic and internally reversible process of a closed system. Isolated systems' entropy cannot diminish.

When a system is not isolated but is in contact with its surroundings, the entropy of the open system may drop, requiring a balancing rise in the entropy of the surroundings. During a process, the entropy of an isolated system constantly increases, or in the case of a reversible process, remains constant (it never decreases).

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6 0

1 year ago

What is the noble gas configuration for silicon?

Delvig [45]

[Ne]3s23p2
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7 0

3 years ago

The reaction A → B + C is known to be zero order in A with a rate constant of 5.0 × 10–2 mol/L·s at 25°C. An experiment was run

DerKrebs [107]

Answer:

D. 2.5 × 10–4 M

Explanation:

Data given in the question are;

rate constant of 5.0 × 10–2 mol/L·s

[A]0 = 1.0 × 10–3 M

5 × 10–3 sec

It was mentioned that the reaction is a zero order reaction. One interesting charaacteristics about zero order reactio is that the rate of reaction is indepenedent on the concentrations of the reactants.

This means in zero order reactions, we have;

Rate = Rate constant

Rate = 5.0 × 10–2 mol/L·s

What is the concentration of B after 5 × 10–3 sec?

Concentration = Rate * Time

Concentration = 5.0 × 10–2 * 5 × 10–3

Concentration = 2.5 × 10–4 M

Correct option = D

4 0

3 years ago

Where does washing powder fall into in the ph scale ?

JulijaS [17]

The powder is made through a chemical reaction (saponification) between an alkaline base with oils is to be expected that there will always be a residual alkali. PH around <span>11.5

hope this helps!

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8 0

3 years ago

Write the cell notation for the voltaic cell that incorporates each of the following redox reactions:(a) Al(s) + Cr³⁺(aq) → Al³⁺

Sladkaya [172]

The cell notation for the given voltaic cell is as follows

Al(s) | Al³⁺(aq) || Cr³⁺ (aq) | Cr(s)

<h3>What is a voltaic cell?</h3>

The device in which electrons are transferred through an external source is known as a voltaic cell.

The electron flow of a Voltaic cell allows redox reactions to produce energy in the form of electricity.

It converts the energy of spontaneous redox reaction into electrical energy

An anode, a cathode, and a salt bridge are all parts of a voltaic cell's setup. The salt bridge serves to neutralize the system.

To write the cell notation, identify the oxidation and reduction reactions.

At the anode, oxidation takes place

$Al(s) \longrightarrow Al^{3+} (aq) + 3e^-$

At the cathode, reduction takes place

$Cr^{3+} (aq) + 3e^- \longrightarrow Cr(s)$

While writing cell notation, the anode is written on the left, and the cathode is written on the right

A single vertical line differentiates between the phases and a double vertical line represents the salt bridge.

Now, write the cell notation of the given Voltaic cell

Al(s) | Al³⁺(aq) || Cr³⁺ (aq) | Cr(s)

Learn more about Voltaic cells:

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7 0

2 years ago