Calculate how many grams of O2(g) can be produced from heating 31.8 grams of KClO3(s).

Answer 1

2KClO3 ==> 2KCl + 3O2
mols KClO3 = grams/molar mass = ?
Use the coefficients in the balanced equation to convert mols KClO3 to mols O2.
Now convert mols O2 to grams. g = mols x molar mass.

Answer 2

31