We know that 1 kmol = 1000 mol, so 2.43 kmol = 2430 mol.
- The atomic mass of sulfur is 32.06 amu.
- The atomic mass of oxygen is 15.9994 amu.
This means the formula mass of sulfur trioxide is
[tex]32.06+3(15.9994)=80.0582 \text{ g/mol}[/tex]
Therefore, the mass is
[tex](80.0582)(2430)=\boxed{1.95 \times 10^{5} \text{ g (to 3 sf)}}[/tex]
