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The thermal decomposition of NOCl is a second-order process, and the rate constant k for the disappearance of NOCI at 160 °C is 0.0037 Msl. What is the concentration of NOCI, initially at 0.043 M, after 20.0 minutes at 160 °C? (A) 0.00051 M (B) 0.036 M (C) 0.040 M (D) 0.042 M Bismuth-212 undergoes both a decay (35.9%) and B decay (64.1%) with an overall half-life of 60.6 minutes. What is its half-life for a decay? (A) 21.8 min (B) 38.8 min (C) 94.7 min (D) 169 min A reaction A R is reversible with K..=100

Answer 1

WWW @ Ans k= 0.0037 M'5 0.043-M initial concentration [A.] = time (t) = 20 min a 600 sec For second order reaction Kt TAPE Oi003.7.X 600 2:22 + 23.25 ITAL a 0.039 M