molality question

[alkaline262]

what is the percent CdSO4 by mass in a 1. m aqueous solution

the answer is 17.2%, but im not sure how they got that

i figured to assume a 1 mol CdSO4 amount in 1kg of H20

1 mol/ 1 kg = 1molal

converting to  grams = 208.47/1000 x 100 = 20.8% by mass
 
the book says the answer is 17.2 %


any suggestions?

[alkaline262]

goodness grief im dumb, nevermind, forgot to add the solute weight to the water weight 

[baba6736]

Thanks for this information.....


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