Question

A plant fertilizer contains 15% \% by mass nitrogen (N {\rm N}). In a container of soluble plant food, there are 15.1oz oz of fertilizer. How many grams of nitrogen are in the container

Answer 1

Answer source : http://www.edcoogle.com/

Given that : 15% of the mass is nitrogen, hence the mass of nitrogen in the container is 10.0*0.15 = 1.5 oz. Now, 1 oz = 28.35 g, so 1.5oz = 28.35 X 1.5 = 42.525 g.