When 100 grams of sodium hydroxide, NaOH, are dissolved in enough water to make 500 mL of solution, the molarity of the solution is- a) 0.800 M
b) 5.00 M
c) 0.440 M
d) 6.00 M

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

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.

Give one example of a pure (exact) number and of an estimated (measured) number.