The distance between Saturn and the Sun is 9.54 AU. (One AU is the same as 150 million kilometers.) This distance in kilometers is million kilometers.

What volume of a 0.25 m solution can be made using 0.55 moles of ca(oh)2

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution