To help farmers and gardeners, commercial fertilizers have a

Last updated: 7/26/2022

To help farmers and gardeners, commercial fertilizers have a big three-number "NPK" label on the bag that gives the amounts of three key plant nutrients: nitrogen, phosphorus and potassium. For example, a bag of "10-10-10" fertilizer has 10% by mass nitrogen, 10% by mass potassium as potash (K,9), and 10% by mass phosphorus as phosphate (P2O5). Suppose a certain fertilizer has the following composition: INGREDIENT PERCENT BY MASS Ammonium Phosphate [(NH4)3PO4] 17% Calcium Nitrate [Ca(NO3)2] 31% Urea [(NH2)2CO] 29% Inert Ingredients 23% What should the first (nitrogen) number on the bag label be? That is, calculate the percent by mass of nitrogen in this fertilizer. Round your answer to the nearest percent.