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max2010maxim [7]
3 years ago
15

To prevent air from interacting with highly reactive chemicals, noble gases are placed over the chemicals to act as inert “blank

eting” gases. A chemical engineer places a mixture of noble gases consisting of 5.50 g of He, 15.0 g of Ne, and 35.0 g of Kr in a piston-cylinder assembly at STP. Calculate the Partial Pressure per Gas​
Chemistry
1 answer:
Ronch [10]3 years ago
6 0

Explanation:

Given parameters:

Mass of He  = 5.5g

Mass of Ne  = 15g

Mass of Kr  = 35g

Pressure at STP = 1atm

Unknown:

Partial pressure per gas = ?

Solution:

Partial pressure is the pressure a gas would exert it alone occupies the container.

 Partial pressure of a gas  = Mole fraction of a gas x Total pressure of mixture

        Number of moles  = \frac{mass}{molar mass}

Number of moles of He  = \frac{5.5}{4}   = 1.375mole

Number of moles of Ne = \frac{15}{20}   = 0.75mole

Number of moles of Kr = \frac{35}{83.8}  = 0.42mole

Sum total of moles  = 1.375 + 0.75 + 0.42 = 2.54moles

Partial pressure of He  = \frac{1.375}{2.54} x 1atm = 0.54atm

Partial pressure of Ne = \frac{0.75}{2.54} x 1atm  = 0.29atm

Partial pressure of kr  = \frac{0.42}{2.54} x 1atm = 0.17atm

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