10. The following reactions take place in a cylinder equipped with a movable pis

Question

10. The following reactions take place in a cylinder equipped with a movable piston at atmospheric pressure. Which reactions will result in work being done on the surroundings, (i.e., wsystem < 0, and the system is expanding)? Assume the system returns to the initial temperature. Hint: The volume of gas is proportional to the number of moles (n) of gas at constant temperature and pressure. If a reaction produces a net increase in the moles of gas, it will expand.

a. CH4 (g) + 2 O2(g) ? CO2(g) + 2 H2O (g)

b. C3H8(g) + 5 O2(g) ? 3 CO2(g) + 4 H2O(g)

Explanation / Answer

a

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