For the reaction I2(g) → I2(s), ΔH° = -62.4 kJ at 25°C. Based on these data, at 25°C A) ΔH°vap = -62.4 kJ/mol.
B) ΔH°vap = 62.4 kJ/mol.
C) ΔH°sub = -62.4 kJ/mol.
D) ΔH°sub = 62.4 kJ/mol.

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Density and pressure

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

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