Chemistry, 15.10.2019 18:00 nev322

Freon−12 (cf2cl2), widely used as a refrigerant and aerosol propellant, is a dangerous air pollutant. in the troposphere, it traps heat 25 times as effectively as co2, and in the stratosphere, it participates in the breakdown of ozone. freon−12 is prepared industrially by reaction of gaseous carbon tetrachloride with hydrogen fluoride. hydrogen chloride gas also forms. how many grams of carbon tetrachloride are required for the production of 28.5 dm3 of freon−12 at 21°c and 1.62 atm?

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Answer from: lemmeboiz43

The mass of carbon tetrachloride required is 293.8 grams.

Explanation:

To calculate the number of moles, we use the equation:

PV=nRT

where,

P = pressure of Freon-12 = 1.62 atm

V = Volume of Freon-12 = 28.5dm^3=28.5L (Conversion factor: 1dm^3=1L )

T = Temperature of Freon-12 = 21^oC=[21+273]K=294K

R = Gas constant = $0.0821\text{ L. atm }mol^{-1}K^{-1}$

n = number of moles Freon-12 = ?

Putting values in above equation, we get:

$1.62atm\times 28.5L=n\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 294K\\n=\frac{1.62\times 28.5}{0.0821\times 294}=1.91mol$

The chemical equation for the formation of Freon-12 follows:

$CCl_4+2HF\rightarrow CF_2Cl_2+2HCl$

By Stoichiometry of the reaction:

1 mole of Freon-12 is formed by 1 mole of carbon tetrachloride

So, 1.91 moles of Freon-12 will be formed by = $\frac{1}{1}\times 1.91=1.91mol$ of carbon tetrachloride

To calculate the mass of carbon tetrachloride, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of carbon tetrachloride = 153.82 g/mol

Moles of carbon tetrachloride = 1.91 moles

Putting values in above equation, we get:

$1.91mol=\frac{\text{Mass of carbon tetrachloride}}{153.82g/mol}\\\\\text{Mass of carbon tetrachloride}=(1.91mol\times 153.82g/mol)=293.8g$

Hence, the mass of carbon tetrachloride required is 293.8 grams.

Answer from: Quest

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Answer from: Quest

Answer

it is the minimum amount of material needed to sustain a fission reaction.

explanation

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining. at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.

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Freon−12 (cf2cl2), widely used as a refrigerant and aerosol propellant, is a dangerous air pollutant...

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