(2) Calcium hydroxide has alkaline, can purify the fish pond, prevent the pond water becomes acidic, absorb the carbon dioxide exhaled by the fish, etc. (choose one of them can).
(3) Let the volume of oxygen produced be x.
2CaO2+2H2O=2Ca(OH)2+O2↑
144 ?32
990g×50% x÷1.43g/L
144 |
32 |
990g×50% |
x÷1.43g/L | <
x≈76.9L
Answer:(1) Energy.
(2) Purification of the fish pond, prevention of acidification of the water in the pond, absorption of carbon dioxide exhaled by the fish, etc. (choose one of them).
(3) It can produce 76.9L of oxygen.