Question

The heat evolved in the combustion of benzene is given by

\[\ce{C6H6 + 7 1/2O2 -> 6CO2_{(g)} + 3H2O_{(l)}}\]; ΔH = −3264.6 kJ

Which of the following quantities of heat energy will be evolved when 39 g C₆H₆ are burnt?

Options

• −816.15 kJ

• 1632.3 kJ

• 6528.2 kJ

• 2448.45 kJ

Answer 1

1632.3 kJ

Explanation:

78 g of benzene on combustion produces heat = 3264.6 kJ

∴ 39 g of benzene will produce = `(3264.6  "kJ")/2`

= 1632.3 kJ