Made two solutions each with a volume of 0.5dm^3 in the first she dissolved 0.2g of NaOH in the second she dissolved 0.6g of NaOH what's the concentration of the two solutions and which one is higher

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

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.

You have a sample of a metal, the sample is exactly 6.02 x 1023atom, if the sample has a mass 55.85 what metal is your sample made of?