Benzene is an aromatic hydrocarbon. It is a colourless and highly flammable liquid. When two moles of benzene are formed, 99.2 kJ energy is produced.
Which of the following expressions represents the balanced chemical equation?
a) 6CO2 + 3H2(g) → C6H6(mc046-1.jpg) + 6O2(g) △H = +49.6 kJ
b) 12C(s) + 6H2(g) → 2C6H6(mc046-2.jpg) △H = –49.6 kJ
c) 6C(s) + 6H2(g) → C6H6(mc046-3.jpg) △H = –49.6 kJ
d) 12C(s) + 6H2(g) → 2C6H6(mc046-4.jpg) △H = +99.2 kJ
e) none of the above
The correct expression that represents the balanced chemical equation for the formation of two moles of benzene is:
b) 12C(s) + 6H2(g) → 2C6H6 ΔH = –49.6 kJ