A time vs. concentration graph is presented below for the reaction A→ B. What is the rate of appearance of B 20 seconds after the start of the reaction? a. 0.050 mol/L×s b. 3.2 mol/Lxs c. 2.2 mol/L×s d. 0.010 mol/Lxs e. 9.8 mol/Lxs 3 {B} mo1/L 14 T T 30 10 20 40 time (seconds)

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