Helium and methane, CH4, are both found in natural gas and can be separated by diffusion. What is the ratio of the diffusion rates for the two species? (rate of diffusion for He divided by the rate for CH4)

Enzymes affect the reactions in living cells by changing the

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.

Can you guys answer these questions i need it before 1: 00pm