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Homework answers / question archive / How many moles of NaF are in 34
How many moles of NaF are in 34.2 grams of a 45.5% by mass NaF solution? What formula does this require?
Answer:
% by mass = mass solute x 100 / mass solution
45.5 % = mass solute NaF x 100 / 34.2
mass solute NaF = 34.2 x 45.5 /100=15.6 g
molae solute NaF = 15.6 g ( 1 mol / 41.9887 g)= 0.372
