A) 759.0
B) 7.6
C) 76.0
D) 752.4
Correct Answer: D
Solution :
Assuming temperature to be \[{{100}^{o}}C\] Relative lowering of vapour pressure Equation\[\frac{{{P}^{o}}-{{P}^{5}}}{{{P}^{o}}}={{X}_{solute}}=\frac{n}{n+N}\] Modified forms of equation is\[\frac{{{P}^{o}}-{{P}_{s}}}{{{P}_{s}}}=\frac{n}{N}\] \[{{P}^{o}}=760\]torr \[{{P}_{S}}=?\] \[\frac{760-{{P}_{S}}}{{{P}_{S}}}=\frac{18/180}{178.2/18}\] \[{{P}_{S}}=752.4\]torr
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