Find the frequency of a photon with a wavelength of 20nm

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

what is your question? collegechemistry 5+3 pts 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.