Question

The value of Δn_g for the oxidation of 4 moles of sulphur dioxide to sulphur trioxide is ______.

Options

• −2

• 2

• −4

• 4

Answer 1

The value of Δn_g for the oxidation of 4 moles of sulphur dioxide to sulphur trioxide is −2.

Explanation:

\[\ce{2SO2(g) + O2(g) -> 2SO3(g)}\]

For 4 moles,

\[\ce{4SO2(g) + 2O2(g) -> 4SO3(g)}\]

Δn_g = (4) − (4 + 2)

= 4 − 6

= −2