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3 years ago

I need help with number 23

Chemistry

1 answer:

kykrilka [37]3 years ago

8 0

It's asking what are the conditions of the water when the three types of fishes overlap. the three kids of fishes overlap over in the middle which is D. mild temperatures, some suspended particles, flows at medium speed.

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Name three ill effects of the industrial revolution

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The depletion of natural resources, the use of chemical and fuel in factories that increased air and water pollution , and increased the use of fossil fuels.

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3 years ago

Be sure to answer all parts. Nitric oxide, NO·, is a radical thought to cause ozone destruction by a mechanism similar to that o

SIZIF [17.4K]

Answer:

See image attached and explanation

Explanation:

The stratospheric ozone layer is very important in absorbing high-energy ultraviolet radiation that is harmful to living systems on earth. The concentration of ozone in the stratosphere is determined by both thermal and photochemical pathways for its decomposition. Nitric oxide, NO, is a trace constituent in the stratosphere that reacts with ozone to form nitrogen dioxide, NO2, and the diatomic oxygen molecule. The nitrogen-oxygen bond in NO2 is relatively weak. When an NO2 molecule encounters an oxygen atom, it transfers an oxygen, forming O2 and NO. The chemical reactions involved are formations of NO2 following by reaction of NO2 with atomic oxygen for form NO and O2. The sum of both reactions show that the overall reaction is simply the reaction of ozone with atomic oxygen to form two molecules of molecular oxygen. Hence, NO only serves as a catalyst, it does not undergo a permanent change itself.

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3 years ago

Theoretical yield of Li2O

pishuonlain [190]

The theoretical yield of Li3N is 20.9 g .

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3 years ago

Please help! Consider the following reaction: 3H2S (g) + 3O2 (g)  2 SO2 (g) + 2H2O (g) If O2 was the excess reagent, 4.15 mol o

iren [92.7K]

Answer:

91.8 %

Explanation:

Data given:

Amount of H₂S = 4.15 mol

Amount of water (H₂O) = 68.55 g

Amount of oxygen O₂ = in excess

Percent yield of reaction water (H₂O) of water = ?

Reaction Given:

2H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

Solution:

First we look for the theoretical yield by looking in the reaction

2H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

As oxygen is in the excess so only H₂S amount act as limiting reagent.

2H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

2 mol 2 mol

to convert amount of H₂O from moles to grams

mass in grams = no. of moles x molar mass

Molar Mass of H₂O = 2(1) + 16 = 18 g/mol

Put values in above equation

mass in grams = 2 mol x 18 g/mol

mass in grams = 36 g

So,

3H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

2 mol 36 g

As from the reaction it is clear that 2 mole of H₂S gives 36g H₂O then 4.15 mole will give how many grams of water

Apply unity formula

2 mol of H₂S ≅ 36 g of H₂O

4.15 mol of H₂S ≅ X g of H₂O

Do cross multiplication

X g of H₂O = 36 g x 4.15 mol / 2 mol

X g of H₂O = 74.7 g

So theoretical yield = 74.7 g of H₂O

Formula used for percent yield

percent yield = actual yield / theoretical yield x 100

Put values in above equation

percent yield = 68.55 g / 74.7 g x 100

percent yield = 91.8 %

***Note

For SO₂ it is important to have actual yield. and implement same work.

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4 years ago

Which statement is true for balanced chemical equations? A) Chemical equations do not provide an accurate way of describing reac

zavuch27 [327]

E) is the correct answer

hope this helps:D

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3 years ago

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