Asolution is made by dissolving 3.40 g of nacl in water to form 58.75 g of solution. what is the mass percent solute in the solution?

To calculate percent by mass, you need to determine two things: the mass of just the element, and the molar mass of the whole compound. We calculate as follows:

Mass percent = (mass of solute / mass of the solution) 100%

Mass percent = [3.40 / (3.40 + 58.75)] x 100 = 1.70%

Hope this answers the question. Have a nice day. 

257 grams h2o i think