when 5 gram of calcium is burnt in 2 gram of oxygen 7 gram of calcium oxide is produced what mass of calcium oxide will be produced when 5 gram of calcium is burnt in 20 gram of oxygen which law of chemical combination will govern your answer
Answers
The law governing this reaction is called the law of reciprocal proportions.
The amount of calcium oxide produced when 5 gms of calcium is burnt with 20 gms of oxygen, will be 7 gms
The reaction between calcium and oxygen is as follows :
2Ca + O₂ = 2CaO
In this reaction we can see that 2 moles of calcium give rise to 2 moles of Calcium oxide.
Which means that the ratio of calcium to calcium oxide is 1:1 no matter what the amount of oxygen present.
Hence the same 5 grams of calcium that gave 7 grams of Cao in first combustion will give the same amount of 7 gms Cao in second combustion also. Here oxygen will remain in excess and will be left out.
the reaction will always have same ratio of calcium and oxygen . so , if 5:2 of calcium and oxygen after reaction forms calcium oxide then 15:6 of calcium and oxygen will react to form calcium oxide. 6g oxygen reacting with 15g of calcium will form 21g of calcium oxide.