Calorimetric studies show that the reaction is exothermic. 2NO2(g) N2O4(g) + 14.1 kcal. Based on this information, which one--if any--of the following additional changes would increase the molar concentration at equilibrium of N2O4(g)?

Answers

Answer 1

Answer: Le Chatelier's principle states changes in equilibrium such as factors like temperature and concentration changes. To increase the molar concentration of N2O4(g), 2NO2(g) should also increase for equilibrium to occur. Now, this equation is exothermic. By Le Chatelier's principle, equilibrium constant and reaction constants also come into play in terms of increasing or decreasing the temperature.

Answer 2

Answer:

It's actually none of the above.

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For the reaction:6Li(s)+N2(g)→2Li3N(s)
Determine:
the mass of N2 needed to react with 0.536 moles of Li.
the number of moles of Li required to make 46.4 g of Li3N.
the mass in grams of Li3N produced from 3.65 g Li.
the number of moles of lithium needed to react with 7.00 grams of N2.

Answers

Explanation:

$6Li(s)+N_2(g)\rightarrow 2Li_3N(s)$

1. Mass of $N_2$ needed to react with 0.536 moles of Li.

According to reaction, 6 moles of Li reacts with 1 mol of $N_2$ .

Then 0.536 moles of Li will react with:

$(1)/(6)* 0.536$ moles of $N_2$ that is 0.0893 moles.

Mass of $N_2[tex] gas needed:</strong></p><p><strong>[tex]=28 g/mol* 0.0893 mol=2.5004 g$

2.The number of moles of Li required to make 46.4 g of $Li_3N$

Moles of $Li_3N=(46.4 g)/(35 g/mol)=1.3257 mol$

According to reaction the 2 moles of $Li_3N$ are produced from 6 moles of Li.

Then 1.3257 moles of $Li_3N$ will produced from:

$(6)/(2)* 1.3257=3.9771 moles$

3.9771 moles of lithium will needed.

3. The mass in grams of $Li_3N$ produced from 3.65 g Li.

Moles of Li $=(3.65 g)/(7 g/mol)=0.5214 moles$

According to reaction, 6 moles of Li gives 2 moles of $Li_3N$

Then 0.5214 moles of Li will give $(2)/(6)* 0.5214$ that is 0.1738 moles of $Li_3N$ .

Mass of $Li_3N=0.1738 mole* 35 g/mol=6.083 g$

6.083 grams of $Li_3N$ will be produced.

4. The number of moles of lithium needed to react with 7.00 grams of $N_2$ .

Moles of $N_2=(7.00 g)/(28 g/mol)=0.25 moles$

1 mol of $N_2$ reacts with 6 mol of Li

Then, 0.25 moles of $N_2$ will ftreact with :

$6* 0.25 moles=1.5 moles$ of lithium

1.5 moles of Li will be needed.

During the 1920s, the trial of Sacco and Vanzetti,the Palmer raids, and the revival of the Ku Klux
Klan demonstrate that
(1) nativist sentiments were on the rise
(2) cultural values were similar between urban
and rural Americans
(3) popular support for international involvement
was increasing
(4) public support for limiting immigration was
declining

Answers

The right answer for the question that is being asked and shown above is that: "(2) cultural values were similar between urban and rural Americans." During the 1920s, the trial of Sacco and Vanzetti, the Palmer raids, and the revival of the Ku Klux Klan demonstrate that cultural values were similar between urban and rural Americans

Which process results in a chemical change? A) Tearing tin foil
B) melting an iron bar
C) crushing an aluminum can
D) burning magnesium ribbon

Answers

burning magnesium ribbon

Final answer:

Among the given options, burning a magnesium ribbon results in a chemical change. It is because the burning process changes magnesium into a new substance, magnesium oxide.

Explanation:

The process that results in a chemical change among the given options is D) burning magnesium ribbon. A chemical change is a process where one or more substances are altered into one or more new and different substances. In the case of burning magnesium ribbon, the magnesium reacts with the oxygen in the air to create a new substance, magnesium oxide. This is a characteristic of a chemical change, which is very different from physical changes caused by tearing tin foil, melting an iron bar, or crushing an aluminum can. These actions alter the physical state or shape of the matter, but not its internal structure or chemical composition.

Learn more about Chemical Change here:

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Which layer spins creating Earth’s magnetic feild

Answers

The Outer Core

Explanation: Deep inside the planet, in a region known as the outer core, the magnetic field of the planet is created.

Why is helium used in airships rather thaan the other nobles gases

Answers

Answer:

It is less dense than air so it will help the airship float, and it is not flammable so the airship is less likely to catch on fire. None of the other noble gases have similar or better reasons.

Explanation:

As you move down group one of the periodic table, what happens to the atomic radii?

Answers

Atomic radius increases down a group, as the distance between the nucleus and the valence electrons increases.

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