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CBSE Class 12-science Answered

calculate freezing point of a solution when 54g of glucose is dissolved in 250g of water
Asked by anamikadas355 | 14 Feb, 2020, 11:28: AM
Expert Answer

Depression of Freezing point can be calculated by-

increment straight T subscript straight f space space equals space straight m cross times straight k subscript straight f
Number space of space moles space of space Glucose equals fraction numerator 54 space straight g over denominator 54 space gmol to the power of negative 1 end exponent end fraction

Molality space of space Glucose space solution equals 54 over 180 cross times 1000 over 250
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space space 1.20 space space mol space kg to the power of negative 1 end exponent
increment straight T subscript straight f space space equals space 1.86 cross times 1.20
space space space space space space space space space equals 2.23 space straight K
Temperature space at space which space solutions space freezes equals left parenthesis 273.15 minus 2.23 right parenthesis equals 270.77 space straight K space space or space space 2.23 space to the power of straight o straight C

Answered by Ravi | 14 Feb, 2020, 12:43: PM
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