As water cools from its boiling point to its melting point its (A) becomes zero.

Question

As water cools from its boiling point to its melting point its (A) becomes zero. (B) decreases to a negative value. (C) increases to a more positive value (D) decreases to a smaller but still positive value. The entropy of systems III, and III compare as (A) I > II > III. (B) I > II = III. (C) II - III > I. (D) III > Il > L. Which is correct for an endothermic reaction that has a positive S? (A) The reaction is spontaneous at all temperatures (B) The reaction is non-spontaneous at all temperatures (C) The reaction is spontaneous at low temperatures but could become non-spontaneous at higher temperatures (D) The reaction is non-spontaneous at low temperatures but could become spontaneous at higher temperatures. which has Which reaction has the largest All gases shown in the figure are at STP. Which statement is correct? The density (g L^-1) of each gas is the same. (B) The mass of the gas is the same in each flask (C) Each flask has the same number of gas molecules (D) There are more H_2 molecules than O_2 or N_2 molecules. 35. A balloon filled with 3, 4 L of an ideal gas at 200 0 K and 0.78 atm is warmed to 300.0 K and the pressure is increased to 01 atm. What is the final volume of the balloon? (A) 66 L (B) 3.9 L (C) 2.9 L (D) 1.8 L. 36. How many moles of gas are in a 0.325 L flask at 0.914 atm and 19.0 degree C? (A) 0.0124 mol (B) 0.191 mol (C) 5.24 mol (D) 80.7 mol 37. What describes a sample of gas containing equimolar amounts of nitrogen and hydrogen at 300 K?

Explanation / Answer

29. The plot representing cooling would be,

(C)

30. entropy change from boiling point of water to melting point of water would be,

(D)

31. for a system with +ve dH and +ve dS, system is,

(D)

32. dHof is zero in standard state,

(D)

33. Greatest entropy change is for,

(A)

34. True statement about gases at STP condition,

(C)

35. moles of gas = PV/nR = 0.78 x 3.4/0.08205 x 200 = 0.1616 mol

Volume of gas at 300 K = nRT/P = 0.1616 x 0.08205 x 300/1.01 = 3.9 L

(B)

36. The correct relation between H2 and N2 would be,

(D)

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