Certain mass of potassium chlorate is thermally decomposed and 3.36 L of O_(2) is collected at STP. What will be the weight of the residue in the experiment?

Certain mass of potassium chlorate is thermally decomposed and 3.36 L

1.	Certain mass of potassium chlorate is thermally decomposed and 3.36 L of O_(2) is collected at STP. What will be the weight of the residue in the experiment?
Answer» Solution :Potassium chlorate on decomposition given potassium CHLORIDE and OXYGEN. `2KCl O_(3) to 2KCl+3O_(2)` 3 moles of `O_(2)-="2 moles of "KCl` `(3 xx 22.4)"L of O"_(2) at STP=(2 xx 74.5)` grams of KCl The WEIGHT of RESIDUE (KCl) OBTAINED when 3.36L of `O_(2)` is collected at STP= `(3.36)/(3 xx 22.4) xx 2 xx 74.5 =7.45"grams"`