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3 years ago

How many molecules of carbon dioxide are in 243.6 g of carbon dioxide

Chemistry

1 answer:

rewona [7]3 years ago

4 0

Answer:

Explanation:

First, lets find the molar mass of CO². This is approximately 12 + 2(16) = 44 g/mol. Now, let's set up the conversions.

This is Avogadro's number

↓

243.6g CO² * (1 mol CO² /44g CO²) * (6.023 * 10^23 molecules/ 1 mol)

When we cancel out the units, we are left with 3.33 * 10^23 molecules of carbon dioxide. I hope this makes sense!

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In the following list, only ________ is not an example of a chemical reaction. the production of hydrogen gas from water the tar

Vika [28.1K]

Answer: Option (c) is the correct answer.

Explanation:

A chemical reaction is defined as the reaction where a chemical bond will break in order to form a new bond due to the formation of a new substance.

For example, $2Na + Cl_{2} \rightarrow 2NaCl$

Here, NaCl is the new substance that is formed. A chemical reaction will always bring change in chemical composition of a substance.

The production of hydrogen gas from water, the tarnishing of a copper penny, charging a cellular phone and burning a plastic water bottle are all chemical reactions.

Whereas a reaction where no change in chemical composition of a substance takes place is known as a physical reaction.

For example, chopping a log into sawdust will change the shape but it will not bring any change in chemical composition of the substance.

Thus, we can conclude that in the following list, only chopping a log into sawdust is not an example of a chemical reaction.

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3 years ago

Which would be the nobel gas preceding Tin?

Alexxandr [17]

Answer: The noble gas preceding tin is Krypton [Kr].

Explanation: Atomic Number of tin is 50 , Atomic Number of neon is 10, Atomic Number of argon is 18, Atomic Number of krypton is 36 and Atomic Number of xenon is 54.

Atomic number tells us the number of electrons present in the atom.

Thus the electronic configuration of tin according to increasing energy of orbitals is written as $[Kr]4d^105s^25p^2$ .

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3 years ago

What information can a foliated metamorphic rock provide you about the conditions under which it formed?

Mnenie [13.5K]

A foliated rock forms when the minerals are realigned due to the presence of high temperature and pressure. The minerals align in such a way that the axes are directed to where the pressure was applied.

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3 years ago

2. What effect does temperature have on the strength of a magnet?

DIA [1.3K]

Answer:

The more the temperature the less the effect if magnet

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3 years ago

UCI Chemistry researchers, Prof. F. Sherwood Rowland and Dr. Mario Molina werefirst to discovered in 1973 that chlorofluorocarbo

Olin [163]

Answer:

15.27895 x 10⁶kg of chlorine radical is added to the atmosphere in a year due to 100 million MVACs

Explanation:

Chlorofluorocarbons (CF₂Cl₂) from refrigerants produce chlorine radicals according to the following equation

CF₂Cl₂ → CF2Cl + Cl ⁻ .........(1)

From equation 1, one mole of CF₂Cl₂ produces one mole of Chlorine radical

From the question,

The emission rate of CF₂Cl₂ is 59.5mg/hour/MVAC

In one day the emission rate would be 59.5 x 24hours

= 1428mg/day

In one year, the emission rate would be 1428mg/day x 365days

= 521220mg/year

= 521.220g/year/MVAC

Therefore the emission rate for 100 million MVAC using CF₂CL₂ in a year is

= 52122 x 10⁶g/year/MVAC

= 52122 x 10³kg/year/MVAC

The molar mass of CF₂CL₂ = 120.913g/mol

No of moles of CF₂CL₂ = mass/ molar mass

= 52122 x 10⁶g / 120.913g/mol

= 431 x 10⁶ moles of CF₂Cl₂

From equation 1, since one mole of CF₂Cl₂ produces one mole of Chlorine radical, it implies that

431 x 10⁶ moles of CF₂Cl₂ would produce 431 x 10⁶ moles of chlorine radical,

Therefore, to find the mass of chlorine radical produced, we use the formula

No of moles of chlorine radical = mass/ molar mass

431 x10⁶ moles = mass of chlorine radical /molar mass of chlorine radical

431 x 10⁶ moles = mass/ 35.45g/mol

mass of chlorine = 431 x 10⁶ moles x 35.45 g/mol

= 15278.95 x 10⁶ g

In Kg, the mass = 15,278.95 x 10³kg of cholrine radical

= 15.27895 x 10⁶ Kg of chlorine radical

6 0

3 years ago