Calculate the enthalpy of formation of anhydrous Al_(2)Cl_(6) from the following data : (i) 2Al(s) + 6HCl(aq) rarr Al_(2)Cl_(2) + 3H_(2)(g) + 1004.2kJ .kJ mol^(-1) (ii)H_(2)(g) +Cl_(2)(g) rarr 2HCl(g) + 184.1 kJ mol^(-1) (iii) HCl(g) + aq rarr HCl(aq) + 73.2kJ mol^(-1) (iv)Al_(2)Cl_(6)(s) +aq rarr Al__(2)Cl_(6)(aq) +643.1 kJ mol^(-1)

Calculate the enthalpy of formation of anhydrous Al_(2)Cl_(6) from the

1.	Calculate the enthalpy of formation of anhydrous Al_(2)Cl_(6) from the following data : (i) 2Al(s) + 6HCl(aq) rarr Al_(2)Cl_(2) + 3H_(2)(g) + 1004.2kJ .kJ mol^(-1) (ii)H_(2)(g) +Cl_(2)(g) rarr 2HCl(g) + 184.1 kJ mol^(-1) (iii) HCl(g) + aq rarr HCl(aq) + 73.2kJ mol^(-1) (iv)Al_(2)Cl_(6)(s) +aq rarr Al__(2)Cl_(6)(aq) +643.1 kJ mol^(-1)
Answer» Solution :AIM `: 2 Al(s) 3Cl_(2)(g) rarr Al_(2)Cl_(6)(s), DELTAH = ?` Eqn. `(I ) + 3 xx `Eqn. (ii) - Eqn. (iv) `+ 6 xx` Eqn. (iii) gives the required result.