Question

What mass of $C{O}_2$ will be formed when 6 g of carbon is burnt in 32 g of oxygen?

• A. 38 g
• B. 12 g
• C. 26 g
• D. 22 g

Answer 1

Answer: (D)

22 g

22 g of $C{O}_2$ will be formed when 6 g of carbon is burnt in 32 g of oxygen.
$C+O_2\to C{O}_2$
The atomic mass of C is 12 g/mol. The molecular masses of $O_2$ and $C{O}_2$ are 32 g/mol and 44 g/mol respectively.
12 g $C$ will combine with 32 g $O_2$ to form 44 g $C{O}_2$.
6 g $C$ will combine with 32 g $O_2$ to form 22 g $C{O}_2$.
Hence, the option (D) is the correct answer.