The green pigment found in plants, chlorophyll, contains one magnesium atom per chlorophyll
molecule. The percentage by mass of magnesium
per chlorophyll molecule is 2.72%. What is the
molar mass of chlorophyll?

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.

An observation that requires measurement is called quantitative observable or qualitative

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent