128 g of sulfur oxide. Calculate the mass of sulfur required to obtain 128 g (IV).

Let’s write the reaction equation:

S + O2 (t) = SO2

Let’s find the amount of sulfur (IV) oxide substance:

v (SO2) = m (SO2) / M (SO2) = 128/64 = 2 (mol).

According to the reaction equation, 1 mol of SO2 is formed from 1 mol of S, therefore:

v (S) = v (SO2) = 2 (mol).

Thus, the required mass of sulfur:

m (S) = v (S) * M (S) = 2 * 32 = 64 (g).

Answer: 64 g.