Auric fluoride

When, for example, a weighed amount of metallic gold contained in a fused silica vessel was treated with excess of bromine trifluoiide, it dissolved rapidly. Excess of solvent, together with free bromine, were then evaporated in vacuum and a white solid remained which had the empirical formula AuBrFg. It was freely soluble in bromine trifluoride and enhanced the conductivity of the latter, so that it may reasonably be formulated as an acid (BrFjAuFJ in the bromine trifluoride solvent system. The compound lost bromine trifluoride when heated to 200° and gave auric fluoride AuFg. 

Write the chemical formulas for (a) cupric sulfide ib) stannous fluoride (c) plumbous chloride id) ferric iodide (e) auric nitrate if ) mercuric sulfide. 

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