minta bantuannya beserta caranya, masih belum paham.

3NH3 + H3PO4 ---->>> (NH4)3PO4

V NH3 = n x 22,4
n = 22,4/1,12 = 20 mol

n H3PO4 = 1/3 x 20 mol = 6,6 mol
m H3PO4 = 6,6, x 98 = 646,8 gram
n (NH4)3PO4 = 1/3 x 20 mol = 6,6 mol
m (NH4)3PO4 = 6,6 x 149 = 983,4 gram