How many moles of NaF are in 34.2 grams of a 45.5% by mass NaF solution?

Calculating is hard, break it down step by step, i don’t understand percentage. I have a multitude of problems to solve like this. Please help

1 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

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