Question

Ammonium phosphate ((NH4)3PO4) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H3PO4) with ammonia (NH3). What mass of ammonium phosphate is produced by the reaction of 6.2 of ammonia? Round your answer to significant digits.

Answer 1

Molar mass of NH3,

MM = 1*MM(N) + 3*MM(H)

= 1*14.01 + 3*1.008

= 17.034 g/mol

mass of NH3 = 6.2 g

mol of NH3 = (mass)/(molar mass)

= 6.2/17.03

= 0.364 mol

Balanced chemical equation is:

3NH3 + H3PO4 —> (NH4)3PO4

According to balanced equation

mol of (NH4)3PO4 formed = (1/3)* moles of NH3

= (1/3)*0.364

= 0.1213 mol

Molar mass of (NH4)3PO4,

MM = 3*MM(N) + 12*MM(H) + 1*MM(P) + 4*MM(O)

= 3*14.01 + 12*1.008 + 1*30.97 + 4*16.0

= 149.096 g/mol

mass of (NH4)3PO4 = number of mol * molar mass

= 0.1213*1.491*10^2

= 18.09 g

Answer: 18 g