17. At 200 K, the molecules of an unknown gas, X, have an average velocity equal to that of Ar gas at 400 K. What is X? (Assume ideal behavior.) Atomic mass: H 1.01, C 12.01, O 16.00, F 19.00, Ar 39.95, Br 79.90
(A) HF
(B) CO
(C) F₂
(D) HBr

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