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k = 1
[A] = [2C]
[C] [D]
K = ________
[A] [B]
[C] [D]
1 = ________
[2C] [B]
1 [D]
1 = ______
2 [B]
1 • 2 • B = 1 • D
2B = D
B = D/2
B = ½D
Jadi, konsentrasi B adalah ½ kali konsentrasi D (Jawaban B)