Question

After 6 g of carbon is completely burnt in an atmosphere of 40 g of oxygen, the percentage oxygen left is:

Answer 1

CARBON : OXYGEN

12             :     16

          3     :    4          

   3/4 = 6/x

    3x = 24

     x = 8

so 8g OXYGEN IS USED  OUT OF 40g

OXYGEN LEFT 32g ....

HOPE IT HELP ...