Indium-115 has a half-life of 4.5 hours. A 24.0 mg sample of indium under goes radioactive decay. How much indium would remain after 27 hours? a)375 mg
b)24.0 mg
c)5.33 mg
d)12.0 mg

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.

__can be defined as which velocity changes

What happens when an acid dissolves?