A student combines 154 grams of carbon tetrachloride and an unknown quantity of bromine in a sealed container to produce 243 grams of dibromodichlormethane and 71 grams of chlorine. How much Bromine was used in the reaction, assuming the reactants are completely used up?

Question

$\begin{array}{1 1} (a)\; 110\; g \\ (b)\; 120\;g \\ (c) \;140\;g \\ (d) \;160\;g \end{array} $