What is the representative particle for carbon dioxide?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Count the number of each type of atom in the equation below, and then balance the equation. write in the numbers of atoms and coefficients. add a 1 if there should be no coefficient. cs2(l) + o2(g) → co2(g) + so2(g) c [ ] s [ ] o > c [ ] s [ ] o [ ] cs2(l) + [ ] o2(g) > [ ] co2(g) + [ ] so2(g)

What can be done to make a solid solute dissolve faster in a liquid solvent?