✔ 最佳答案
(1)
答案是: (B) 2
[H^+] = 0.02 x 50% = 0.01
pH = -log[H^+] = -log(0.01) = 2
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(2)
答案是: (A) [OH-] = 6M
(A) [H^+] = KW/[OH^-] = (1 x 10^-14)/6 = 1.7 x 10^-15 M ..... 最小
(B) [H^+] = 0.4 M
(C) [H^+] = 10^-1.4 = 0.040 M
(D) [H^+] = 10^-(14-5.9) = 7.9 x 10^-9
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(3)
答案是:(D) 8克甲烷(CH4)所含的氫原子
(A) H原子數目 = (3.01 x 10^23) x 2 = 6.02 x 10^23 個
(B) H原子數目 = 5 X 10^23 個
(C) H原子數目 = [8.5/(14 + 1x3)] x 3 x (6 x 10^23) = 9 x 10^23 個
(D) H原子數目 = [8/(12 + 1x4)] x 4 x (6 x 10^23) = 1.2 x 10^24 個