Question

Enthalpy change for freezing of $1\, g$ of water at $1\, bar$ and $0^{\circ} C$ is $334 \,J$. Calculate the internal energy change in $J$ when $1 \,g$ of water is converted into ice?

• A. 205
• B. 334
• C. 0
• D. 668

Answer 1

Answer: (B)

When $1\,g$ water is converted into ice then internal energy is equal to enthalpy change for freezing at 1 bar and $0^{\circ} C$.

$1\,g \, H _{2} O (a q) \rightleftharpoons H _{2} O $ (ice)

Enthalpy change for freezing of $1\,g$ of water at l bar and $0^{\circ} C$ temperature is $334 \,J$.

Hence, internal energy equal to $334 \,J$