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Chemistry 4 Online
OpenStudy (anonymous):

How many moles of sodium chloride solute are in 315 grams of a 91.0 percent by mass solution?

OpenStudy (wolfe8):

How much is 91% of 315 g?

OpenStudy (anonymous):

286.65?

OpenStudy (wolfe8):

Yup. So that is the mass of sodium chloride. To fine the number of moles, use n=m/molar mass where n is the number of moles and m is mass in g. Use http://www.ptable.com/

OpenStudy (wolfe8):

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