Chemistry
posted by Anonymous .
Rank the following fertilizers in decreasing order of mass percentage of nitrogen:
NH3
NH4NO3
(NH4)2HPO4
KNO3
(NH4)H2PO4
(NH4)2SO4

You need to work out the mass percentage of N in each. So in each case you need to the molar mass then calculate the % N content from
Total mass of N x100%/(molar mass) 
i worked out the mass percentage of N in each and this is what i got
NH3=82.25%
NH4NO3=35%
(NH4)2HPO4=21.4%
KNO3=13.85%
(NH4)H2PO4=12.17%
(NH4)2SO4=11.85%
i put in order and still get it wrong __
Total mass of N x100%/(molar mass) 
NH3
NH4NO3
(NH4)2HPO4
(NH4)2SO4
KNO3
(NH4)H2PO4 
NH3
NH4NO3
(NH4)2HPO4
(NH4)2SO4
KNO3
(NH4)H2PO4