155. A sample of ammonia gas at 65.5°C and 524 torr has a volume of 15.31 L. What is its volume when the temperature is-15.8°C and its pressure is 524 torr? A) 3.69 L B) 11.6 L C) 20.2 L D) 63.5 L not possible, since the volume would have to be negative E) 156. A 500-mL sample of argon at 800 torr has its absolute temperature quadrupled. If the volume remains unchanged what is the new pressure? A) 200 torr E) 3200 torr D) 2400 torr C) 800 tor B) 400 torr 157. What are the conditions of STP? A) 0K and1 atm B) 273.15 K and 760 torr C) 0°C and 760 atm 273.15°C and 760 torr D) none of the above E) 158. A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP? A) 25.2 L B) 30.6 L C) 33.6 L D) 37.1 L E) 49.2 L 159. Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. A sample of nitrogen dioxide has a volume of 28.6 L at 45.3°C and89.9 kPa. What is its volume at STP? A) 21.8 L B) 27.6 L C) 29.6 L D) 37.6 L E) 153 L 160. Calculate the pressure of a helium sample at-207.3°C and 768 mL if it exerts a pressure of 175 kPa at 25.0°C and 925 mL. A) 32.1 kPa B) 46.6 kPa C) 657 kPa D) 953 kPa E) not possible, since the pressure would have to be negative 161. Calculate the temperature of an argon sample at 55.4 kPa and 18.6 L if it occupies 25.8 L at 75.0°C and 41.1 kPa. A) 95.0°C B) 85.1°C C) 77.2°C D) 72.9°C E) 65.2°C 59 162. 15.0 g of ice cubes at 0.0°C are combined with 150. g of liquid water at 70.0°C in a coffee cup calorimeter. Calculate the final temperature reached, assuming no heat loss or gain from the surroundings. (Data: specific heat capacity of H2O(I), c = 4.18 J/g.°C; H2O(s) A) 0.0 → H20(1) B) 10.6 AH = 6.02 kJ/mol) C) 30.7 D) 43.2 E) 56.4 163. A backpacker collects snow at 0°C, and places it in a cooking pot on a camp stove. It takes 643 kJ of heat energy to melt the snow and bring the water to boiling. Assuming no heat loss, and neglecting the specific heat capacity of the pot, calculate the mass of snow that the backpacker collected. (Data: specific heat capacity of liquid water, c = 4.18 J/g-K; and: H20(s) → H2O(1) AH= AHfusion = 6.02 kJ/mol) A) 1.92 kg B) 1.90 kg C) 1.52 kg E) <800 g D) 855 g 164. The specific heat capacity c of a metal is approximately related to its molar mass follows: cx M as = 3R, where R is the universal gas constant, 8.314 J/mol-K. Use this relationship to identify the metal which has a specific heat capacity of 0.900 J/g-K. A) Li 22 B) Sn C) Ca D) Al E) U 165. What is the final temperature when 20.0 g of water at 25°C is mixed with 30.0 g of water at 80°C? A) 35°C B) 42°C C) 53°C D) 58°C E) 70°C 166. 40.0 g of ice cubes at 0.0°C are combined with 150. g of liquid water at 20.0°C in a coffee cup calorimeter. Calculate the final temperature reached, assuming no heat loss or gain from the surroundings. (Data: specific heat capacity of H20(1), c = 4.18 J/g.°C; H2O(s) → H2O(1) A) 0.0 AH= 6.02 kJ/mol) C) 30.7 Sure B) 10.6 D) 43.2 E) 56.4 167. A piece of copper metal is initially at 100.0°C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20.0°C. After stirring, the final temperature of both copper and water is 25.0°C. Assuming no heat losses, and that the specific heat (capacity) of water is 4.18 J/(g K), what is the heat capacity of the copper in J/K? A) 2.79 J/K above C) 13.9 J/K D) 209 J/K B) 3.33 J/K E) none of the 5.8 60