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| Molality(m) is the number of moles of solute per kilogram of solvent. Note the difference between the formula for molarity & molality. Both have moles of solute as the numerator. For molarity, the denominator is liters of solution, for molality it is kilograms of solvent. Also, the symbol for molarity is a capital M, for molality, it is a lower case m. |
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For example: If 38.0 grams of sodium chloride is dissolved in 880. grams of water, what is the molality of the solution? You
must first convert grams to moles by dividing the compound's molar mass. |
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