You and a partner are asked to complete a lab entitled "Fluorides of Group 6B Metals" that is scheduled to ex-tend over two lab periods. The first lab, which is to be completed by your partner, is devoted to carrying out compositional analysis. In the second lab, you are to determine melting points. Upon going to lab you find two unlabeled vials, one containing a colorless liquid and the other a green powder. You also find the following notes in your partner's notebook—Compound 1: 47.7% Cr and 52.3% F (by mass), Compound 2: 45.7% Mo and 54.3% F (by mass). (a) What is the empirical formula for Com-pound 1? (b) What is the empirical formula for Com-pound 2? (c) Upon determining the melting points of these two compounds you find that the colorless liquid solidifies at 18 °C, while the green powder does not melt up to the maximum temperature of your apparatus, 1200 °C. What is the identity of the colorless liquid? What is the identity of the green powder? Be sure to use the appropriate naming convention depending upon whether the compound is better described as a molecular or ionic compound.
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