A mixture of 1 g naphthalene ( mol mass 128) and 10 g camphor melts at 147 degree celcius where - Chemistry - Solutions

Question

A mixture of 1 g naphthalene ( mol mass 128) and 10 g camphor melts
at 147 degree celcius where as pure camphor melts at 177 5 degree
celcius What is cryoscopic constant ( Kf) of camphor

Raveena Sharma · Accepted Answer

1 The formula of cryoscopic constant:

∆Tf = Kf×m

2 ∆Tf =177 5 -147 = 30 5

Molality of naphthalene = 1128101000=1128×100010=0 781

3 Kf = 39 C/m

A mixture of 1 g naphthalene ( mol mass 128) and 10 g camphor melts at 147 degree celcius where as pure camphor melts at 177.5 degree celcius. What is cryoscopic constant ( Kf) of camphor