Plutonium-236 is an alpha emitter with a half-life of 2.86 years. If a sample initially contains 2.35mg of Pu-236, what mass of Pu-236 is
present after 10 years?
a. 0.228mg
b. 0.208mg
c.0.198mg
d. 0.188mg

Which solution is an example of a nonelectrolyte? a. iodine in hexane b. sodium nitrate in waterc. acetic acid in waterd. hydrogen chloride in water

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.