8 This question is about the reaction between hydrogen sulfide (H2S) and oxygen.
The equation for the reaction is:
2 H2S(g) + 3 O2(g) → 2 H2O(g) + 2 SO2(g)
8-1 What does H2O (g) represent? [1 mark]
ANSWER
Water vapour / Steam
8-2 Calculate the volume of oxygen required to react with 50 cm3 of hydrogen sulfide. [1 mark]
ANSWER
75 cm3
8-3 Figure 6 shows part of the reaction profile for the reaction. The reaction is exothermic.
Complete Figure 6.
You should:
complete the profile line
label the activation energy
label the overall energy change.
[3 marks]
ANSWER
8-4 Figure 7 shows the displayed formula equation for the reaction of hydrogen sulfide with oxygen.
Figure 7
Table 5 shows some of the bond energies.
Table 5
In the reaction the energy released forming new bonds is 1034 kJ/mol greater than the energy needed to break existing bonds.
Calculate the bond energy X for the 
bond. Use Figure 7 and Table 5. [5 marks]
ANSWER
Now
