$3.$ In the Solvay process, $200$ kg of Na$$CO$$ is produced. Calculate the amount of NaCl required assuming $100\%$ efficiency. $($Molecular weight of Na$$CO$=106$ g$/$mol$,$ NaCl $=58\mathrm{.}44$ g$/$mol$)$

$4.$ Calculate the mass of CaCl$$ produced when $50$ moles of NaCl is used in the Solvay process. $($Molecular weight of CaCl$=110\mathrm{.}98$ g$/$mol$,$ NaCl $=58\mathrm{.}44$ g$/$mol$)$