Chem 3321 Problem session 1 problems 1. The escape velocity is the velocity an object must have to escape the earth’s gravitational field and be launched into outer space. What is the escape velocity of a 2 ton pickup truck launched from a GM car dealership in North Texas under the Cars for Clunkers Program ? (b) Compare this to the escape velocity of a 3 x 10 6 kg Saturn V rocket launched by NASA. (c) Suppose that both are propelled by the burning of oxygen and hydrogen according to the exothermic reaction H 2 (g) + O 2 (g) H 2 O(g). The reaction liberates 242 kJ of energy per mole of water formed. How many pounds of hydrogen are needed to propel each of the two objects into outer space ? 2. A sample consisting of 1.5 mol of perfect gas molecules with C p,m = 20.8 J/K-mol is initially at 230 kPa and 315 K. It undergoes a reversible adiabatic expansion until its pressure reaches 170 kPa. Calculate the final volume and temperature and the work done. 3.
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