11- 24c. The plot of CAvs. t begins at (t=0, CA=1). When t=0, the slope (=dCA/dt) is − ×=−01 101... As t increases, CAdecreases ⇒dCA/dt=-0.1CAbecomes less negative, approaches zero as t→∞. CA→0 as t→∞. The curve is therefore concave up.The plot of CBvs. t begins at (t=0, CB=0). When t=0, the slope (=dCB/dt) is 02 1 002.().−=. As t increases, CBincreases, CAdecreases (CB2< CA)⇒dCB/dt =0.2(CA-CB2) becomes less positive until dCB/dt changes to negative (CB2> CA). Then CBdecreases with increasing t as well as CA. Finally dCB/dt approaches zero as t→∞. Therefore, CBincreases first until it reaches a maximum value, then it decreases. CB→0 as t→∞
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