Question

lodine trichloride, ICl₃ is made by reacting iodine with chlorine.

I₂(s)+Cl₂(g) → 2 IC l(s) ; Δ H°=+14 kJ mol^-1

ICl(s)+C₂(g) → ICl₃(s): Δ H°=-88 kJ mol^-1

By using the data above, what is the enthalpy change of the formation for solid iodine trichloride?

A -60 kJ mol^-1

B -74 kJ mol^-1

C -81 kJ mol^-1

D -162 kJ mol^-1

8 In the extraction of aluminium by electrolysis, why is it necessary to dissolve aluminium oxide in molten cryolite?

A to reduce the very high melting point of the electrolyte

B cryolite provides the ions needed to carry the current

C cryolite reacts with the aluminium oxide to form ions

D molten aluminium oxide alone would not conduct electricity

Answer 1