Textbook Problem

In the reaction ${\text{CaCl}}_{\text{2}}+{\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}\to {\text{CaCO}}_{\text{3}}+2\text{NaCl}$, if $\text{0}\text{.5}\text{mole}$ of $\text{NaCl}$ is to be formed, then:

a. $\text{1}\text{mole}$ of ${\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}$ is needed.

b. $0.5\text{mole}$ of ${\text{CaCO}}_{\text{3}}$ is also formed.

c. $0.5\text{mole}$ of ${\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}$ is needed.

d. $0.25\text{mole}$ of ${\text{CaCl}}_{\text{2}}$ is needed.