Which of the following substances is paramagnetic? A. KCl B. MgO C. CaCl2 D. Fe2O3 E. CuI   B) Analysis of a compound finds it contains 25.0% of species X, by mass, and 75.0% of species Yby mass. The molar mass of species X is 25.0 g/mol, and the molar mass of species Y is 150. g/mol.If the molar mass of the compound is 600. g/mol, what is the molecular formula of the compound? A. X6Y4 B. X4Y5 C. X6Y3 D. X4Y4 E. X2Y5   C) Magnesium metal reacts with hydrochloric acid to produce hydrogen gas and an aqueoussolution of magnesium (II) chloride. What substance is being oxidized. A. H2(g) B. MgCl2(aq) C. HCl(aq) D. Mg(s) E. MgCl(aq)

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