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[" For an elementary chemical reaction,"A_(2)(A_(1))/(A_(1))=2A," the "],[" expression for "(d[A])/(dt)" is "],[[" (a) "k_(1)[A_(2)]-k_(-1)[A]^(2)," (b) "2k_(1)[A_(2)]-k_(1)[A]^(2)],[" (c) "2k_(1)[A_(2)]-2k_(1)[A]^(2)," (d) "k_(1)[A_(2)]+k_(1)[A]^(2)]],[[" (c) "2k_(1)[A_(2)]-2k_(1)[A]^(2)," (d) "k_(1)[A_(2)]+k_(1)[A]^(2)]]

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