1- Determine the empirical formula and the molecular formula of a compound (Freon II) That consists of 8.74%C,77.43%Cl,13.83%F and has a molecular mass of 137g/mol. [C12.0;Cl35.5;F19.0] 2. The mass pereent of water in a hydrate of MnCl2 is 36.41%. What is the empirical formula of the hydrate? [Mn 54.9; Cl 35.5] 3- A 4.00g sample of a hydrate of nickel(II) bromide loses 0.793g of water when heated. Determine the mass percent water in the hydrate and the formula of the hydrate. [Br79.9;Ni58.7] Data sheet Show units \& correct significant figures \begin{tabular}{|l|l|l|} \hlinea & Mass of crucible \\ \hlineb & Mass of crucible + unknown \\ \hlinef & Mass of crucible + unknown after final heating \\ \hlineg & Mass of original unknown \\ \hlineh & Mass of water lost by heating \\ \hlinei & Mass percent of water in unknown (\% H2O ) \\ \hlinej & Mass of unknown salt remaining after heating & \\ \hlinek & Formula mass of the anhydrous (without water) salt & \\ \hlinel & Number of moles of anhydrous unknown salt & \\ \hlinep & Formula of the unknown hydrate \\ \hlineq & Formula mass of water \\ \hlinen & Number of moles of water lost \\ \hline & Ratio of moles water to moles of unknown \\ \hline & \\ \hline & \\ \hline & \\ \hline & \\ \hline \end{tabular}