3. Which of the following contain most number of hydrogen atoms ?
(A) 2.0 x 10⁶ mg H₂O
(B) 10 ppm H₂ in 10kg dry ice
(C) 1.0 x 10⁴ ng H₂
(D) 10^-4 mole CH₄

考試重點本題在考**「氫原子數量的計算...