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3 years ago

Based on the information above, do you think that fluorine has common isotopes? Justify your answer.

Chemistry

2 answers:

Simora [160]3 years ago

5 0

Answer is: fluorine does not have common isotopes, because its average atomic mass is 19.

Fluorine has only one isotope occurs naturally in abundance, the stable isotope F-19.

This isotope has:

1) n(p⁺) = 9; fluorine has atomic number Z = 9 (total number of protons).

2) n(e⁻) = 9; in an element, number of electrons and protons are the same.

3) n(n°) = 10; mass number of this isotope is A = 19. Mass nummber is total number of protons and neutrons in a nucleus, so number of neutrons is:

n(n°) = A-Z.

n(n°) = 19-9.

n(n°) =10.

andre [41]3 years ago

4 0

Answer:

No, it hasn't. Because it has 9 protons and 10 neutrons and its average mass is 19, it has no common isotopes.

Explanation:

An isotope is an atom of the element which has the same atomic number (number of protons), but a different mass number. For example, hydrogen has 3 isotopes: H¹, H², and H³, all with an atomic number equal to 1.

The mass that is represented in the periodic table is the weighted average of the masses of the isotopes, based on the percentage that they're found in nature.

The mass of an atom is concentrated in the nucleus, so it is the mass of the protons plus the mass of the neutrons, which are equal to 1 amu (atomic mass unity).

For the fluorine atom with mass 19.00 and atomic number 9, we can infer it has 10 neutrons. Because the average mass is exactly 19.00 we can infer that all the fluorine atoms have 9 protons and 10 neutrons ( it's easy to observe in the periodic table that the masses are not exactly).

Then, we can infer for the information that fluorine has no common isotopes.

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Answer 1) In the given reaction of sulfuric acid

$2NO_{(g)} + O_{2}_{(g)} ----> 2NO_{2}_{(g)}$

$2NO_{2}_{(g)} + 2SO_{2}_{(g)} ----> 2NO}_{(g)} + 2SO_{3}_{(g)}$

On addition of nitrogen monoxide gas the reaction rate increases and more amount of product is formed.

So, it is clear that NO is the catalyst in this reaction.

Answer 2) This can be proven that NO is catalyst because it increases the rate of the reaction, but it is not consumed during the reaction, and it also gets regenerated at the end of reaction.

Hence, nitrogen mono oxide is considered as the catalyst in the given reaction.

Answer 3) It increases the rate of reaction by decreasing the activation energy of the reaction. Also it can be clearly seen in this reaction the NO is reacting with oxygen to lower the energy of activation. So, it is providing an alternative pathway for proceeding the reaction. This all confirms the assumptions of NO being the catalyst.

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3 years ago

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It takes 167 s for an unknown gas to effuse through a porous wall and 99 s for the same volume of n2 gas to effuse at the same t

irakobra [83]

Answer : The molar mass of the unknown gas will be 79.7 g/mol

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We can compare the rates of both the gases;

So here, Rate of gas 2 / Rate of gas 1 = $\sqrt{(molar mass 1 / molar mass 2)}$

Now, 1.687 = square root [ $\sqrt{(molar mass 1) / (28.01 g/mol N_{2})}$ ]

When we square both the sides we get;

2.845 = (molar mass 1) / (28.01 g/mol N2)

On rearranging, we get,

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For example, a sandy water will have some parts (usually the bottom) of the mixture with more sand than other parts of the mixture, hence, it (sandy water) is a heterogeneous mixture. While salty and ocean water has it's salt dissolved in the same proportion throughout the water in the mixture, hence salty and/or ocean water is a homogeneous mixture.

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4 years ago

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The correct option is;

Scientist propose explanations that can be explained by examining evidence

Explanation:

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