PHW 4 . Chapter 10 Assignment 4 ± Dalton\'s Law of Partial Pressure Part A What

Question

PHW 4 . Chapter 10 Assignment 4 ± Dalton's Law of Partial Pressure 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 A 1.00 L flask is filled with 1.10 g of argon at 25 °C. A sample of ethane vapor is added to the same flask until the total pressure is 1.050 atm View Available Hint(s) PAr=/ Value Units Submit 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 View Available Hint(s) ethane alue Submit

Explanation / Answer

(A)

M Ar = 39.948 g

T = 250C = 25+273.15K = 298.15 K

P Ar = nAr * R * T / V = (1.10 / 39.948) * 0.0821 * (298.15)/1 = 0.674 atm

(B)

Using Dalton's law that P total = sum of all pressure of all gases

=> P total = P Ar + P ethane => 1.050 = 0.674 + P ethane => P ethane = 1.050 - 0.674 = 0.376 atm

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