Ch6Problems

Ch6Problems - Chapter 6 Gases 39. A sample of gas has a...

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Chapter 6 Gases 39. A sample of gas has a volume of 4.25L at 25.6°C and 748 mm Hg. What will the volume of this gas be at 742 mm Hg and 26.8°C? P 1 V 1 = P 2 V 2 T 1 T 2 V 2 = P 1 V 1 T 2 P 2 T 1 = 748 mm Hg x 4.25L x 299.95K = 742 mm Hg x 298.75K 4.30L 41. A constant-volume vessel contains 12.5g of a gas at 21°C. If the pressure of the gas is to remain constant as the temperature of the gas is raised to 210°C, how many grams of gas must be released? n 1 T 1 =PV = n 2 T 2 R n 1 T 1 = n 2 T 2 n 2 = T 1 n 1 T 2 = 294K 483K = 0.609 n 2 = 0.609n 1 m 2 /MW = 0.609m 1 /MW =0.609x12.5g = 7.609g 12.5g-7.609g = 4.89g
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43. A 12.8L cylinder contains 35.8g O 2 at 46°C. What is the pressure of this gas in atmospheres PV = nRT P = nRT V = 35.8g/32.0g mol -1 x 0.08205L atm mol -1 K -1 x 319K 12.8L = 2.29 atm 45. A 72.8L cylinder containing 1.85 mol He is heated until the pressure reaches 3.50 atm. What is the final temperature in degrees Celcius PV = nRT T = PV nR = 3.50 atm x 72.8L 1.85 mol x 0.08205L atm mol
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Ch6Problems - Chapter 6 Gases 39. A sample of gas has a...

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