An unknown metal $J($not its chemical symbol$)$ forms a solid carbonate with the chemical formula $J_{2}C{O}_3.$

The carbonate reacts with hydrochloric acid $(HCl)$ according to the equation below.

$J_{2}C{O}_{3(s)}+2HC{l}_{(aq)}2JC{l}_{(aq)}+C{O}_{2(g)}+H_2{O}_{(1)}$

Some solid $J_{2}C{O}_3$ is placed into an Erlenmeyer flask and the mass of the flask and its contents are recorded.

$\backslash$table$[[$Mass of empty Erlenmeyer flask,$140\mathrm{.}68g$