Question

A) Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is 3.90 atm . Calculate the partial pressure of each gas in the container. Express the pressure values numerically in atmospheres, separated by commas. Enter the partial pressure of methane first, then ethane, then propane.

B) A gaseous mixture of O2O2 and N2N2 contains 34.8 %% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 845 mmHg ?

Express you answer numerically in millimeters of mercury.

Answer 1

SOLUTION hy 18.00 g), quantity The gaseous minture consists of CH (18.0 g) and an unknown of CzHg. For me thane ((M4), Temperater og 28°C = ( 273 +23) k = 296k 8.00 - 0.500 moles & moles (n) = low 2016 Volume of container = 10 Using PV = nRT le gos Px 100 = 0.500x 0.022x - Pa 1021 atm. or partial pressure of Chy - 10 21 aty 30 For ethane ( CHO). Mass = 18.08 8. Moles (n) = 18 moles - 0.600 moles volume of container - (OL- Temperature - 23°C = 296k! Using gas law, . Px 10 = 0.600+ 0.082 x 296 P = 1.46 atm partial pressure of C H - 1.46 am or

I of Cho biven & Total pressure = 3.90 atm. Also, Total pressure I Partial pressure / Partial pressure Po of the + Partial pressure 1 of ₂ H8 using already calculated values, 16+ Partial pressure 3.90 = 1.21 & 1.4bt 1 of CHg. - Partial pressus & 1.23 atm. of C₂ H8 Using gas law, Peste x V - Nghe x R x T 1023x10 - Nhi 0.082 x 296 2 Noto 2 0.507 moles & Unknown mass of – 10.507x 44) a propane - 22-31 gute Assuming the gaseous minture to be of 100 g, Mass of nitrogen - 34.89 & moles of nitrogen (Ne d = 34.8 moles 8 mo - 10 24 moles

Mass of onygen (100-34-8 Jg - 65.2g . moles of unggen = 165.2 moles (mo) - 2.04 moles - 845 vom Hg Total pressure of minture pressure & & Total pressure Partial of O2 no total no total pressure no + 2.04 & 845 mm Hg. 2.04+1.24 - 525-55 mm Hg NOTE & The above relation of partial pressu is derived from the fact that pressure is directly proportional to number of moles..

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