What is the boiling point of a solution containing 2.33 g of caffeine, #C_8H_10N_4O_2#, dissolved in 15.0 g of benzene? The boiling point of pure benzene is 80.1 °C and the boiling point elevation constant, Kbp, is 2.53 °C/m.
1 Answer
The boiling point of the solution is 82.1 °C.
Explanation:
The formulae for boiling point elevation is
#color(blue)(|bar(ul(ΔT_"b" = K_"b"m)|)#
where
#ΔT_"b"# is the boiling point elevation#K_"b"# is the boiling point elevation constant#m# is the molality of the solution
Our first task is to calculate the molality of the solution.
The molar mass of caffeine,
Now, we calculate the boiling point elevation.
Finally, we calculate the new boiling point.