CH 09 HW Plus or minus Dalton\'s Law of Partial Pressure Resources Plus or minus

Question

CH 09 HW Plus or minus Dalton's Law of Partial Pressure Resources Plus or minus Dalton's Law of Partial Pressure A 1.00 L flask is filled with 1.05g of argon at 25 Degree C. A sample of ethane vapor is added to the same flask until the total pressure is 1.050atm . 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. PAr=0.613 atm Part B What is the partial pressure of ethane, P ethane, in the flask? Express your answer to three significant figures and include the appropriate units. P ethane=0.377 atm

Explanation / Answer

we know

PV = nRT

n = moles of gases

T = 298 K; V = 1litre ; R = 0.0821

moles of argon (n) = 1.05 / 39.94 = 0.0262 moles

initial pressure when argon only present in flask ;

P = nRT/V = 0.64

after adding ethane vapour;

we know Pt =1.05 atm

V = 1 litre ; n is changed due to addition of ethane

finding n;

n = PtV/RT = 0.0429 moles

total moles = 0.0429

0.0429 = moles of Ar + moles of ethane

moles of ethane = 0.0167

Par = Pt * mole fraction of Ar = 0.641 atm

Pethane = Pt*mole fraction of ethane = 0.408 atm

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