Question

The aqueous solution $0.01 M$ of $\left[ Cr \left( NH _{3}\right)_{6}\right]_{2}\left[ Co \left( NH _{3}\right)\left( NO _{2}\right)_{5}\right]_{3}$ is expected to have $\Delta T _{ f }$ equal to Given: $K _{ f }$ of $H _{2} O$ is $1.86 K kg mol ^{-1}$.

• A. $0.0186^\circ C$
• B. $0.0372^\circ C$
• C. $0.0558^\circ C$
• D. $0.093^\circ C$

Answer 1

Answer: (D)

$\Delta T_{f}=i\times m\times K_{f}$
$=5\times 0.01\times 1.\text{86}$
$=9.30\times 0.01=0.093^\circ C$