[Ann1234]

hello, I have this problem and I can't get anywhere with it..

Ammonium nitrate, a potential ingredient of terrorist bombs, can be made nonexplosive by addition of diammonium hydrogen phosphate,(NH4)2HPO4- . Analysis of such a NH4NO3-(NH4)2HPO4 mixture showed the mass percent of nitrogen to be 30.47%. What is the mass ratio of the two components in the mixture?

I am not sure what do to with 30.47%, can someone give me some help on how should I start? thanks..

[AWK]

It means that every 100 grams of your mixture contains 30.47 grams of nitrogen.
You should set 2 equation with 2 variables.

[Ann1234]

It means that every 100 grams of your mixture contains 30.47 grams of nitrogen.
You should set 2 equation with 2 variables.

okay I have that equation so far: mass N (NH4NO3) + mass N (NH4)2HPO4 = 30.47 GRAM

what I can't find is the second one, I tried calculating the %N on each compound and also that

mass nh4no3 + mass nh42hpo4 = 100 g and I ended up with 4 equations and 4 unknowns but the answer didn't make sense =(..

[Ann1234]

okay I have that equation so far: mass N (NH4NO3) + mass N (NH4)2HPO4 = 30.47 GRAM

what I can't find is the second one, I tried calculating the %N on each compound and also that

mass nh4no3 + mass nh42hpo4 = 100 g and I ended up with 4 equations and 4 unknowns but the answer didn't make sense =(..


[/quote]

oh I got it  ..I kept thinking why my answer didn't make sense so I checked numbers-I made a mistake when I calculated the % of N in NH4NO3--thanks for the help as always!!! 

[AWK]

mass N in (NH4NO3) + mass N in (NH4)2HPO4 = 30.47 GRAM
mass NH4NO3 + mass (NH4)2HPO4 = 100.00 GRAM

[Ann1234]

mass N in (NH4NO3) + mass N in (NH4)2HPO4 = 30.47 GRAM
mass NH4NO3 + mass (NH4)2HPO4 = 100.00 GRAM

yes I used both and it worked thanks