17. Which of the following gases is expected to have a higher solubilit in waer

Question

17. Which of the following gases is expected to have a higher solubilit in waer than is predicted using Henry's law? A) NH B) N2 C) H2 D) Ar E) CH 18. For the reaction X + Y Z, the reaction rate is found to depend only upon the concentration of X. A plot of L/X verses time gives a straight line. [x] 4 - time(s) 50 What is the rate law for this reaction? A) rate k [X] B) rate = k(X][Y) C) rate - k [XJ[Y] D) rate k [X] A solution thatís 33.6% by mass of phenol (al Oll) in water is prepared what is the mole fraction of the phenol? A) 0.0604 B) 0.0969 C) 0.0643 D) 0.357 E) 0.0883 19. The vapor pressure of water at 20°C is 17.5 mmHg. What is the vapor pressure of water over a solution prepared from 2.00 x 10° g of sucrose (CaH:01) and 3.50 x 10 g water? A) 17.0 mmHg B) 18.0 mmHg C) 16.0 mmHg D) 19.4 mmHg E) 0.51 mmHg 20. Version 1 Page 5

Explanation / Answer

Ans 19

Basis 100 g of mixture

Moles of phenol = mass of phenol /molecular weight

= 33.6/94.11

= 0.357 mol

Moles of water = (100-33.6)/18

= 3.688 mol

Total Moles = 3.688 + 0.357 = 4.045 mol

Mol fraction of phenol = moles of phenol /total moles

= 0.357/4.045

= 0.0883

Option E is the correct answer

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