If you have a stock solution of 10 M HCl and you want to prepare 200 mL of 4 M HCl, what volume of the concentrated acid should be added to what volume of water? (Assume volumes are additive.)

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.

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

How do dying stars contribute to the formation of planets