sole wilthe reported molar mass ofthe soute betoo hgh b) loaOw. crepo sane al a
ID: 543883 • Letter: S
Question
sole wilthe reported molar mass ofthe soute betoo hgh b) loaOw. crepo sane al a thermometer is mscaitra ed to reed 1°C higher than the actual temperaure ove s eme Hint. Follow a complete se1-up for the calculation to see the eflect of the error Explain b) If te cyclchexane is initaly contamnated wth a soluble nen-reactive, nonvolatile sutrit ance, w -change inteezing portal be a) higher b) lower, or the line a·the urortarinated cydohecane? 5) Explain why the treeang pont of a pure sovent is constamt whereas the teezing pom of solution decreases with steady cocing -1t-Explanation / Answer
4.a. The total heat can measured as, deltaH = m. c. deltaT; where, deltaH is difference in heat, m= mass of the substance, c= specific heat, deltaT is difference in temperature. Thus, if the thermometer is miscalibrated to read 1.0 degC higher than the actual temperature, the molar mass measurement will be same (c), since only the difference in the temperature is required to calculate such and not the actual temperature.
b. If the cyclohexane is contaminated with soluble, non-volatile, non-reactive substance, then the change in freezing point, deltaT1 will be higher (a). The solubility of contaminating substances lower the freezing point than the pure substance.
5. The solubility of contaminating substances lower the freezing point than the pure substance. This is the reason behind the fact that freezing point of a pure solvent is constant but freezing point of a solution decreaseswith steady cooling.
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