試題詳解

77. The rate of effusion of an unknown gas is measured and found to be 24 mL/min. Under the same condition, the rate of effusion of CO gas is 38 mL/min. Which is the best formula of this unknown gas?
(A) CO₂
(B) H₂O
(C) C₅H₁₀
(D) C₆H₆
(E) C₂H₅OH