How many moles of mgcl2 are there in 307 g of the compound?

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.

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?