Consider the following reaction: N2(g) + 3H2(g) ↔ 2NH3(g) ΔH = - 92.4 kJmol -1

a) The absolute entropy values, S, at 238 K for N2(g), H2(g) and NH3(g) are 192, 131 and 193 J K -1mol -1respectively. Calculate ∆Sº for the reaction and explain the sign of ∆Sº.

b) Calculate ∆Gº for the reaction at 238 K. State and explain whether the reaction is thermodynamically favored.

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If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?

In november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.