Use the following answers for questions 1 - 3

A 17. Question 17-18 refer to the following elements. (A) Lithium (B) Nickel (C) Bromine (D) Uranium (E) Fluorine . 17. Is a gas in its standard state at 298 K . 18. Reacts with water to form a strong base 1999 RXN Genl Info B 20. What mass of Au is produced when 0.0500 mol of Au2S3 is reduced completely with excess H2? ................
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