Question

A solution contains 4.44% by mass of NaI in water. Calculate the molarity of the NaI, if the density of the solution is 1.2711 g mL-1.

i got the answer to be 8.48 M... the percent mass is irrelevant information, right? i figured out the answer just by the given density alone.
Knowing the density alone cannot tell you the molarity of the solution unless you have a lookup table of density vs. molarity, based upon previous measurements.

The % by mass of NaI is not irrelevant.
what is the percent yield of SiF4 using the mixture in the previous question if 8.76g of SiF4 is obtained from the reaction

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