8. At the same temperature and pressure, the time required for a certain gas to diffuse is 4 times that of the same volume of hydrogen (H2). Which of the following is the gas? (atomic mass: H = 1, N = 14, O = 16, S = 32)
(A)O2
(B) CO2
(C) NH3
(D)SO2

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統計： A(1), B(0), C(0), D(0), E(0) #2818074