NH4NO3+NaOH△。 ? NaNO3+NH3↑+H2O
80 17
x3.4g
80 17=x3.4g
x= 16g
Mass fraction of nitrogen in NH4NO3 = 14×280× 100%=35%?
The mass fraction of nitrogen in the sample =16g× 35% 20g×100% = 28% > 25%.
A: The nitrogen content of this nitrogen fertilizer sample is up to standard.