Task 2.1h

Q1. Calculate the enthalpy of reaction for: (answer = -42kJmol^-1)
C₂H₄(g) + H₂0(g) --> CH₃CH₂OH(g)
given the following bond enthalpy terms:
C-C +347 kJmol^-1, C=C +612 kJmol^-1, C-H +413 kJmol^-1, O-H +464 kJmol^-1, C-O +358 kJmol^-1.

Q2. Calculate the mean bond enthalpy of the SiF bond in SiF₄(g) given: (answer = +597kJmol^-1)
enthalpy of formation of SiF₄(g) = -1615 kJmol^-1
enthalpy of atomisation of silicon = +456 kJmol^-1
enthalpy of atomisation of fluorine = +79 kJmol^-1

Q3. Calculate the enthalpy of formation of but-1-ene CH₂=CHCH₂CH₃(g) given:
enthalpy of atomisation of carbon = +717
enthalpy of atomisation of hydrogen = +218
bond enthalpy terms as above (answers=+2kJmol^-1)

Q4. Calculate the enthalpy change for the reaction between methane and chlorine
CH₄(g) + Cl₂(g) --> CH₃Cl(g) + HCl(g)
given the bond enthalpy terms above and Cl-Cl +243 kJmol^-1, C-Cl +346 kJmol^-1, H-Cl +432 kJmol^-1. (answers=-122kJmol^-1)

Q5. Work out the enthalpy of reaction for N₂(g) + 3H₂(g) --> 2NH₃(g)  given the bond enthalpy terms: E[N=N] = + 945 kJmol^-1, E[N-H] = + 389kJmol^-1, E[H-H] = +436 kJmol^-1 (answers=-81kJmol^-1)