1. Tardigrade
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  3. Chemistry
  4. Enthalpy change when 1 g water is frozen at 0° C is: (Δ H text fus =1.435 kcal mol -1)

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Q. Enthalpy change when $1\, g$ water is frozen at $0^{\circ} C$ is : $\left(\Delta H_{\text {fus }}=1.435\, kcal\, mol ^{-1}\right)$

Bihar CECEBihar CECE 2003Thermodynamics

Solution:

Enthalpy change per gram water is calculated by dividing $\Delta H$ by molecular mass of water.
Given $\Delta H =1.4354\, kcal\, mol ^{-1}$
$=-\frac{1.4354}{18}=-0.0797\, kcal g ^{-1}$