The strands of DNA are held together in the double helix by intermolecular attractions between atoms on one strand and nitrogen or oxygen atoms on the other strand.

Write a net ionic equation to show that hydrofluoric acid, behaves as an acid in water.

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.

How many moles are contained in 5.6 l of h2 at stp