Question

When $3g$ of carbon is burnt in $8g$ of oxygen, $11g$ of carbon dioxide is produced. What mass of carbon dioxide will be formed when $3g$ of carbon is burnt in $50g$ oxygen?

• A. $12g$
• B. $13g$
• C. $11g$
• D. $10g$

Answer 1

The correct option is C $11g$

This is governed by the law of definite proportion. Carbon and oxygen combine in $3:8$ ratio. So $11g$ of carbon dioxide is formed.

Hence, in the latter case too, only $8g$ of $O_2$ will be reacted with 3g of carbon (because carbon is the limiting reagent here ) to form 11g of $C{O}_2$ and $42g$ of oxygen will remain unreacted.

Hence, the correct option is C.