What is the total number of oxygen atoms in the formula mgso4•7h2o? [the • represents seven units of h2o attached to one unit of mgso4.]
(1) 11 (3) 5
(2) 7 (4) 4

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Calculate the concentration of all species in a 0.165 m solution of h2co3.

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.