Question

Determine whether the following processes are endothermic or exothermic given the equation and value for the change in ethalpy.

1. Conversion of methyl alcohol to carbon monoxide and hydrogen

  CH2OH --> CO2 + 2H2    ∆H= +90.7kj

2. Formation of hydrofluoric acid from hydrogen and flourine

  H2 + F2 --> 2HF     ∆H= -557kj

3.Combustion of acetone

  C3H6O + 4O2 --> 3CO2 + 3H2O ∆H= -1790kJ

4. Formation of methane gas from graphite and hydrogen

  C + 2H2 --> CH4    ∆H= -74.7kJ

 5. Evaporation of water

  2 H2O(/) --> 2 H2O(g)   ∆H= +88 kJ

Answer 1

1.Endothermic

2.Exothermic

3.Exothermic

4.Exothermic

5.Endothermic