The moles that are present in 150 g of ammonium hydrogen phosphite is 1.136 moles
calculation
The formula of ammonium hydrogen phosphite = (NH4)2HPO4
moles = mass/molar mass
mass= 150 g
molar mass of (NH4)2HPO4 = [ ( 14+ 1x4)2) +1 + 31 + ( 4 x16)] =132 g/mol
moles is therefore = 150 g/ 132 g/mol =1.136 moles