1 APSC 150 Practice Questions for Quiz - Case 2 Q1 Calculate the grams of O2 produced if 2.50 g of KClO3 are decomposed completely by heating. Balanced reaction 2 KC103 -> 2 KCI + 302 A. 0.976 g O2 B. 9.760 g O2 C. 2.930 g O2 D. 1.956 g O2 E. 0.325 g O2 Q2 For the reaction A + B + C, the rate constant at 215 ? is 5.0 x 103 and the rate constant at 452º C is 1.2 x 10-1. i) What is the activation energy in kJ/mol? ii) What is the rate constant at 100° C. A. i) 19.7 KJ/mol ii) 2.5 x 10-4 s-1 B. i) 19.7 KJ/mol ii) 1.25 x 10-4 s-1 C. i) 39.4 KJ/mol ii) 1.25 x 10-4 s-1 D. i) 39.4 KJ/mol ii) 2.5 x 10-4 s-1 E. i) 78.8 kJ/mol ii) 2.5 x 10-4 s-1 Q3 How many grams of nitric acid, HNO3, can be prepared from the reaction of 138 g of NO2 with 54.0 g H2O according to the equation below? 3NO2 + H20 -> 2HNO3 + NO A. 92 108 B. C. 126 D. 189 E. 279 APSC 150 - Case 2 - Chemical Reaction Car / Term 2 - 2013/14
2 Q4 A 1 litre gas tank is filled with air to a pressure of 5000 kPa. If the tank is held at 300 K, then the density of the gas in the tank is: Hint: The gas constant R = 8.314 Pa.m3.mol-1.K-1 and the molar mass of air is 28 g/mol. A. 56.1 [g/cm3] B. 56.1 [kg/m3] C. 56130 [kg/m3] D. 56.1 [kg/cm3] E. 56130 [g/cm3] Q5 Consider the following reaction: N2 + 3H2 > 2NH3 The rate of formation of NH3 is 3.0 mL/min. The rate of consumption of H2 is: A. 1.5 mL/min B. 2 mL/min C. 4.5 mL/min D. 6 mL/min E. 9 mL/min Q6 In the following reaction: C2H5OH + m 02 -> p H20+ q CO2 m is equal to: A. 0.5 B. 1 C. 2 D. 3 E. 3.5 APSC 150 - Case 2 - Chemical Reaction Car / Term 2 - 2013/14
3 Q7 For the tank given below, if the initial h = 75 cm (at t = 0); the initial exit velocity of the liquid (U2) would be: 1 Z1= h Liquid h Area A - Discharge to atmosphere 1 22 =0 2 Q Hints: g= 9.81 m/s2 ; p= 1000 kg/m3 Bernoulli's equation between points (1) and (2) is: P +2+82,- P2 + 2 +82 A. 14.72 [m/s] B. 1477 [cm/min] C. 38.36 [cm/s] D. 3.84 [m/s] E. 3836 [m/min] APSC 150 - Case 2 - Chemical Reaction Car / Term 2 - 2013/14