9) What mass of oxygen is formed when 735 g of potassium chlorate
decomposes?
2 KCIO3 + 2 KCI + 3 O2
(3)
10)
What mass of hydrogen is produced when 195 mg of potassium is added to
water?
2 K + 2 H2O → 2 KOH + H2
(3)
11)
How much calcium oxide is produced by heating 50 g of calcium carbonate?
CaCO3 + CaO + CO2
(3)
12)
What mass of magnesium oxide is formed when 6 g of magnesium reacts with
oxygen?
2 Mg + O2 + 2 Mgo
(3)