b
Weight of solute \((w)\,=\,1\,g\)

Weight of solvent \((W)\,=\,75\,g\)

Boiling point of solution \(=\,100.114\,^oC\)

Boiling point of solvent \(=\,100\,^oC\)

\(\Delta T\,=\,100.114\,-\,100\,=\,0.114\,^oC\)

Molecular weight of solute \((m)\,=\,60.1\)

Boiling point elevation contant \((K)\,=\,?\)

\(m\, = \,\frac{{1000\, \times \,K \times \,w}}{{\Delta T\, \times \,W}}\)

\(K\, = \,\frac{{m \times \,\Delta T\, \times \,W}}{{100\, \times \,w}}\)

\( = \,\frac{{60.1\, \times \,0.114 \times \,75}}{{1000 \times 1}}\)

\( = \,\frac{{513.8}}{{1000}}\, = \,0.513\)