1.
Sublimation temperature of dry ice (solid CO2) is __________ °C.

2.
The equation relating E, P, V and T which is true for all substanes under all conditions is given by $${\left( {\frac{{\partial {\text{E}}}}{{\partial {\text{V}}}}} \right)_{\text{T}}} = {\text{T}} \cdot {\left( {\frac{{\partial {\text{P}}}}{{\partial {\text{T}}}}} \right)_{\text{H}}} - {\text{P}}{\text{.}}$$      This equation is called the

3.
Henry's law is closely obeyed by a gas, when its __________ is extremely high.

4.
If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero.

5.
The ammonia synthesis reaction represented by N2 + 3H2 ⇋ 2NH3; ΔH = -22.4 kcal, is