Question 1 , the correct answer is X Page 2 of 8 Exam #2 February 25, 2017 CHEM

Question

Question 1 , the correct answer is X Page 2 of 8 Exam #2 February 25, 2017 CHEM 1312: 1. A sample of solid NH,NO, was placed in an evacuated container and then heated so that it decomposed according to the following equation and established equilibrium: NH,NO,(s) -N20(g) + 2 H2O(g) K, for this reaction at a certain temperature is 16.38. What is the pressure of H,O at equilibrium? A. 1.60 atm 4.05 atm B. 2.13 atm C. 3.20 atm D. 3.73 atm 2. Arrange the acids H,Se, HI, and HBr in order of increasing acid strength A. C. E. H,Se

Explanation / Answer

1. Kp = pN2O*pH2O^2

    16.38 = X*(2X)^2

X = 1.6

Partial pressure of H2O = 2*1.6 = 3.2 atm

answer: C. 3.2 atm

2. answer: A. H2Se < HBr < HI

iodine has less electronegativity than Br.so that, HI is more acidic than HBr.

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