6HF + 3 NaAlO2 = Na3AlF6 +3H2O +Al203
calculate moles of Na3AlF6 formed
moles =mass/molar mass
molar mass of Na3AlF6 =209.94 g/mol
convert 3.47Kg to grams , that is 3.47 x1000= 3470 grams
moles is therefore= 3470 g/ 209.94 g/mol = 16.53 moles
by use of mole ratio between NaAlO2 to Na3AlF6 which is 3:1 therefore the moles of NaAlO2 is (16.53 x3)/ 1= 49.59 moles
mass of NaAlO2 is =moles of NaAlO2 x molar mass NaAlO2
that is 49.59 mole x 81.97 g/mol = 4064.89 grams or 4.065 Kg