Chapter 6, Problem 15ALQ

Which of the following correctly balances the chemical equation given below? There may be more than one correct balanced equation. If a balanced equation is incorrect, explain why it is incorrect.

m:math> CaO + C → CaC 2 + CO 2

msp;  ${\text{CaO}}_2+3\text{C}\to {\text{CaC}}_2+{\text{CO}}_2$

msp;  $\text{2CaO}+5\text{C}\to 2{\text{CaC}}_2+{\text{CO}}_2$

msp;  $\text{CaO}+2\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.\text{C}\to {\text{CaC}}_2+\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.{\text{CO}}_2$

msp;  $\text{4CaO}+10\text{C}\to 4{\text{CaC}}_2+2{\text{CO}}_2$