Which of the following are characteristics of reverse-phase chromatography? i the stationary phase is polar. ii the mobile phase is more polar than the stationary phase. iii less polar mobile phase has a lower eluent strength. iv more polar mobile phase has a higher eluent strength. v the stationary phase is nonpolar.

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.