To help farmers and gardeners commercial fertilizers have a big three number NPK label on the bag that gives the amounts of

Question

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 O and 10 by mass phosphorus as phosphate P O5 Suppose a certain fertilizer has the following composition ingredient ammonium phosphate NH4 PO4 Ca NO3 calcium nitrate urea NH CO inert ingredients percent by mass 17 31 29 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

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