CHEMISTRY MIDDLE SCHOOL

Calculate the mole fraction of each gas in a mixture of 43.6 g Xe and 36.8 g Kr. show work

Answers

Answer 1

Answer:

Xe = 0.431 mole

Kr = 0.569 mole

Explanation:

We are asked to calculate the mole fraction of each gas

Let's start from, what is mole fraction?

Mole fraction is the ratio of the number of moles of a substance to the total number of moles of all substance present in the mixture

In this question, we are provided with

Xe - 43.6g

Let's find the number of mole

n = m/Mm

n - number of mole

m - number of mass in grams

Mm - number of molar mass

The molar mass of Xe according to the periodic table is 131.293u

m - is given to be 43.6g

n = 43.6g / 131.293g/mol

n = 0.332mole

Secondly,

Kr - 36.8g

The molar mass of Kr is 83.798

m = 36.8

Using the same formula we used above to find mole

n = 36.8g / 83.798g/mol

n = 0.439mole

Let's calculate the total number of mole in the mixture

Total number of mole = 0.332 + 0.439

= 0.771 mole

To find each mole of each gas in the mixture, using this formula

Mole fraction of a gas = mole of gas A / total mole of the mixture

In Xe = 0.332 / 0.771

= 0.431 mole of Xe in the mixture of the gas

For Kr = 0.439 / 0.771

= 0.569 mole of Kr in the total mixture

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Answers

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Explanation:

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How are elements arranged on the periodic table

Answers

The elements on the periodic table are arranged by their atomic number (amount of protons). They are also arranged so that the elements with similar properties are arranged next to each other.

hey are arranged according to proton amount

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Answers

Define means to definition of a word. Compare means to shows differences and similarities of two or more things like a book verses a movie.

define means to give a definition of a word you are saying what it means. On the other hand to compare means to name similarities between objects

Why are some examples of a chemical reaction not actually foolproof evidence that of a chemical reaction?13, 8th grade, and I'm doing my science lab report: The lab was a chemistry lab. We got a bunch of toxic chemicals and put pairs of them together, recorded the reactions, and wrote balanced equations for each of them and identified what kind of reaction they were. The whole name of the lab is "Evidence of Chemical Reactions", and one of the first analysis questions is "write a paragraph about the kinds of changes you would expect to see if a chemical reaction occurs." I answered this with things like bubble formation, change of color, change of state of matter, etc. Then the next question said "any one of these signs is not always a fool proof indication that a chemical reaction is occurring. give two examples to support this statement."
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Answers

So basically, the change in color effects the amount of cations in the solution making it a physical change rather than a chemical one, defying the law of conservation of mass! I hope this helped! (The only time the change in color affects the amount of cations is in the Alkaline Earth Metals)

source: college science teacher

Bubble formation, change of color, and change of state are not foolproof evidence of a chemical reaction due to physical changes and variations in the reactions.

While bubble formation, change of color, and change of state of matter are commonly associated with chemical reactions, they are not always foolproof evidence. Two examples to support this statement are:

Physical changes can mimic some of these signs. For example, the melting of ice is a change of state, but it is a physical change rather than a chemical reaction.
Some chemical reactions may not produce the expected signs. For instance, some reactions may be slow or occur at very low concentrations, making it difficult to observe noticeable changes.

Therefore, it is important to consider multiple lines of evidence and conduct further analysis to confirm the occurrence of a chemical reaction.

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Answers

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world destruction,
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Answers

The subscript 2 on the Bromine, Br atom simply means Magnesium ion is; Mg²+.

Discussion:

When magnesium ion, Mg²+ combines with an halogen like Bromine, Br-.

In such scenario, there must be a balance of charges for the formation of a compound like MgBr2.

As such, 2 Br- ions and 1 Mg²+ are necessary to maintain charge balance in the compound.

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Final answer:

The '2' in Magnesium bromide (MgBr2) represents the 2 bromide ions that associate with each magnesium ion in the ionic compound, ensuring overall neutrality.

Explanation:

In the ionic compound Magnesium bromide (MgBr2), the '2' signifies the number of bromine (Br) atoms that are combined with a single atom of Magnesium (Mg) to form this compound. This is due to the fact that magnesium (Mg) has two valence electrons which it donates to form a stable compound, resulting in a Mg2+ cation. The bromine atom accepts one electron to form a Br- anion. Since Mg needs to donate two electrons, two Br ions are required, which gives us the '2' in MgBr2. This ratio of ions ensures neutrality of the overall ionic compound.

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