Answer:
so calculate moles of 1785 g of NaF
this is something = 1785/41.98 =42.52 moles
now one moles of HF is forming one mole of NaF so to get 42.52 moles of NaF we need 42.52 moles of HF
mass = moles × molar mass
mass of HF = 42.52×20.01
mass of HF = 850.82 g
so the conclusion is if you need 1785 g of NaF (sodium Fluoride) you need 850.82 grams of HF (hydrofluoric acid) !!!
I d k it's right or wrong but i tried to solve it, please let me know is it correct or not!!
