Question

When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combinations will govern your answer?

Answer 1

when 3.00 g of carbon is burnt in 50.00g of oxygen then the mass of carbon dioxide formed =53.00g

according to the law of conservation of mass the total mass before and after the reaction remains same.

so 3.00g +50.00g =53.00g

hope it helps...

Answer 2

SOLUTIONS:

Our answer will be governed by the law of constant proportions.

Now, since carbon and oxygen combine in the fixed proportion of 3 : 8by mass to produce 11 g of carbon dioxide, therefore, the same mass of carbon dioxide (11 g) will be obtained even if we burn 3 gram of carbon in 50 gram of oxygen.

The extra oxygen (50 -8 = 42 g oxygen) will remain unreacted.