Question

8,9,10,&11

a. U.1/5mL b.56.9mL C.0.0280 mL d. 8.61ml 1.23 m TL 1000 ML 8. If 24.2g of potassium chloride is added to 0.50 L of water, what is the molarity of the solution2 a. 1.54 M b. 0.16 M C. 0.65 M d. 0.83 M 9. The volume of a 0.156 moles of gas is 400.0 mL at 30.0*C and 3.44 atm. If the temperature is increased to 50.0°C and pressure goes up to 5.64 atm and volume is now 425.3 ml, what is the final amount of gas in moles? a 0.156 mol C. 0.510 mol b. 0.255 mol d. 0.247 mol 10. The total air pressure at sea level is 101.3 kPa. The following partial pressures were obtained. What is the partial pressure of O2? Gas Partial Pressure 70.2 kPa a. b. c. d. 87.4 kPa 101.3 kPa 13.9 kPa 1206 kPa CO Trace gases 15.9 kPa 1.3 kPa 11.A balloon is heated from 23.0 K to 56.0 K. The balloon will a. expand b. shrink C expand then shrink d. none of the above

Answer 1

8. Gram molecular weight of kela 74. 55g Molailty : weight of Kel gim.wt of Kel volume of solution (2) 24.291 74.559 0.5 L = 0.6496 moles L - 0.65 M 1. Ans cool Initial Final Volume O(M)Loom moles (n.) = 0.156 mol Temperature (Ti) = 30c = 303 volume (V2) ? ? 425,3 ml Moley (m) : ? Temper teor (T2)2 58c = 323k pressure (P2) = 5.64 atm pressure (P) = 3.44 tm I P, V, n, Ti n₂Tz X " z e tą Pivi (5.64 utm) (425.3 mi), (0.156 mol) (303 k) (323k ) (3.44 atm) (400 mi) no 0.255 moley Ans: (b)

. 10) According Daltong Law of partial pressures Total pressure of p = PM₂ + Po, tP copt Prraces Air 101.3 kPa = 7012 kPa + Pot 15.9kpa +1.3 kpa 1:3 - 15.9 -1.3 kPa Por = 13.9 kPa Ans: (c) where I Prz, Po,, Pro, and Pirac are the Nį, į , co and Trace gases partial pressury of respectively. pressure the at the Incoreaky. Gas we know that at constant temperature increasy volume of Hence balloon Expands. (Any (a)