How many grams of a 23.4% by mass NaF solution is needed if you want to have 1.33 moles of NaF?
A)55.9
B)31.1
C)13.1
D)239
E)none of the above

Question

Quizplus · Accepted Answer

1.33 moles of NaF = 1.33 x 41.99 g/mol = 55.93 g NaF
In a 23.4% by mass solution, there are 23.4 g NaF per 100 g solution.
Let x be the mass of solution required.
23.4 g NaF/100 g solution = 55.93 g NaF / x g solution
x = 239 g solution.

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