5.27. The following reactions take place in a cylinder equipped with a movable p

Question

5.27. The following reactions take place in a cylinder equipped with a movable piston at atmospheric pressure (Figure P5.27) Which reactions will result in work being done on the surroundings? Assume the system returns to an initial temperature of Define the systen and indicate the RABBER inetic 110 C. (Hint: The volume of a gas is proportional to number of moles, n, at constant temperature and pressure.) a. CH(g) +20(g) - Pac BIG FIGURE PS CO(g) + 2 H O(g) c. N(g) + 20(g) 2 NO (g) ng: "5.2s. In which directionwill the piston shown in Figure P53.1 e, move when the following reactions are carried out at tmospheric pressure inside the cylinder and after the system has returned to its initial temperature of 110 C Hint: The volume of a gas is proportional to number of %URE Break a B temperat moles, n, at constant temperature and pressure.) 5.37. a. N2(g) + 3 H2(g) ? 2 NH3(g) b. ?(s) + O2(g) What is CO2(g) c. CH,CH2OH(g) +3 O2(g) 2 CO (g) +3 H )5.38. Plaster sulfate "5.29. Filling Air Bags Automobile airbags produce nitrogen gas to 150 plaste 2 (C Wh gyp from the reaction: a. If 2.25 g of NaN, reacts to fill an air bag, how much P-Vwork will the N2 do against an external pressure of 1.00 atm given that the density of nitrogen is 1.165 gL 5.39. M at 20°C? b. If the process releases 2.34 kJ of heat, what is AE for the fo hi system? 5.30. Black Powder Igniting gunpowder produces nitrogen and carbon dioxide gas that propels the bullet by the reaction: 5.40.

Explanation / Answer

5.27

A and b reactions are known to be the systems which are doing work on the surroundings.

528.

For the reaction a , the piston moves downwards because it requires more pressure to yield products (compression- work done by the surroundings on system).

For the reactions b and c, the piston moves upwards because the products expands after formation. (Expansion- work done by the system on surroundings)

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