?Mastering Chemistry Chaper 11—Questions Part B: A closed container is filled wi

Question

?Mastering Chemistry Chaper 11—Questions

Part B: A closed container is filled with oxygen. The pressure in the container is 325 kPa . What is the pressure in millimeters of mercury? Express the pressure numerically in millimeters of mercury.

Part A: A syringe containing 1.71 mL of oxygen gas is cooled from 92.1 ?C to 0.5 ?C. What is the final volume Vf of oxygen gas?

Part A What is the partial pressure of argon, Par, in the flask? Express your answer to three significant figures and include the appropriate units. PArValue Units Submit Hints My AnswersGive Up Review Part Part B What is the partial pressure of ethane, Pethane, in the flask? Express your answer to three significant figures and include the appropriate units. PethaneValueUnits

Explanation / Answer

Ch-11

part b) 1 Pa = 0.0075 mm of Hg

So 325 KPa = 2437.5 mm of Hg

A)

Let x moles of Ethane be added to sample container.

Total Pressure = 1.05 atm

V = 1 L

T = 250C = 298 K

total moles (n) = x+(1.45/40) = x + 0.03625

PV = nRT

1.05 = (x + 0.03625) x 0.0821 x 298

x = 0.0067

So PAr V = 0.03625 x 0.0821 x 298 = 0.88 atm

Pethane V = 0.0067x 0.0821 x 298 = 0.16 atm

Part B) Oxygen-nitrogen problem

Let total mass of mixture be 100g

Mass of nitrogen = 36.8 gm, So moles of N2 = 1.31

Mass of Oxygen = 63.2 gm, So moles of O2 = 1.975

XN2 = 0.4 & XO2 = 0.6

So PO2/PN2 = nO2/nN2

PN2 = PO2 x 1.5

PT = PN2 x XN2 + PO2 x  XO2 = PO2 (1.5XN2 + XO2)

PO2 = 254.16 mm of Hg

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