Question

A) A solution of c6h2o4 in c2h5oh has a boiling point of 80.38 Celsius. what is the molality of the solution ?

B) what is the approximation of concentration of dissolved solution in blood, if the osmotic pressure is 7.65 atm at 37Celsius.

Answer 1

a. molality-m=1.623

b. molarity-M=0.3

Further explanation

a. Boiling point

$\tt \Delta Tb=Kb\times m$

Kb for ethanol=1.22 °C/m

Boiling point for ethanol = 78.4 °C

ΔTb=80.38-78.4=1.98

$\tt 1.98=1.22\times m\\\\m=\dfrac{1.98}{1.22}=1.623$

b. osmotic pressure

$\tt \pi =MRT$

π = 7.65 atm

R = 0.08205 L/atm K

T = 37 + 273 = 310 K

$\tt M=\dfrac{\pi}{RT}=\dfrac{7.65}{0.08205\times 310}=0.3~M$