CBSE Class 12 Chemistry 2013 Solved Paper

Question : 9 of 30

Marks: +1, -0

18 {\g}

of glucose,

{\C}_6 {\H}_{12} {\O}_6 (.

Molar Mass

=180 {\g} {\mol}^{-1})

is dissolved in

1 {\kg}

of water in a sauce pan. At what temperature will this solution boil?

( {\K}_{ {\b}}.

for water

=0.52 {\K} {\kg} {\mol}^{-1}

, boiling point of pure water

=373.15 {\K}

)

Solution:

\Δ{T}={{K}_{{b}} \×{W}_{{B}} \× 1000}/{m_{{B}} \×{W}_{{A}}}

\Δ{T}={0.52 \×18 \×1000}/{180 \×1000}=0.052

{T}-{T}_{{b}}=0.052

{T}-373=0.052

{T}=373+0.052

{T}=373.052 {K}

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