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A sample of 10.00g of a solid unknown was dissolved in 25.00g of water. Assuming that pure water freezes at 0.0°C and the solution freezes at -5.58°C, what is the molal concentration of the solution? What is the molar mass of the solid? Show your calculation.

I got that the molality is 3.00 m and the MM is 133 g/mol but I'm not sure if I'm right

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That looks good to me.

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