Can someone please help me figure out how to find the mass % concentration of an unknown solution? I found the masses and volumes of 4 known solutions (2% NaCl, 4% NaCl, 6% NaCl, and 8% NaCl) and used this data in the Excel LINEST function. I'm supposed to use the resulting equation and the calculated density of the unknown solution to find the mass % concentration. I don't want someone to just do it for me- that's why I didn't list actual values- but I have no idea how to even start.

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Can you post the actual problem, maybe? :\

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