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The reaction A -> B follows first-order kinetics with a half-life of 21.7 hours. If the concentration of A is 0.023 M after 48.0 hours, what is the initial concentration of A? a. 0.0050 M b. 0.051 M c. 0.51 M d. 0.11 M e. 2.0 ´ 102 M

Nitrosyl bromide decomposes according to the chemical equation below.         2 NOBr(g) ⇌ 2 NO(g) + Br2(g) When 0.260 atm of NOBr is sealed in a flask and allowed to reach equilibrium, 22% of the NOBr decomposes. What is the equilibrium constant, Kp, for the reaction? a. 2.3 x 10–3 b. 4.5 x 10–3 c. 3.5 x 10–2 d. 4.8 x 10–2 e. 8.0 x 10–2

Which are the Brønsted–Lowry acids in the following equilibrium? CH3COO–(aq) + H2O(l)  ⇌ CH3COOH(aq) + OH–(aq) a. CH3COO– and OH– b. H2O and OH– c. H2O, CH3COOH, and OH– d. CH3COO– and CH3COOH e. H2O and CH3COOH

Who was a leading figure in the Civil Rights Movement and delivered the famous ‘I Have a Dream’ speech?

What was the primary goal of President John F. Kennedy’s New Frontier initiative?

What was the significance of the Tet Offensive in 1968?

Which president is often associated with attempts to unify the nation after the divisiveness of the late 1960s and early 1970s?

How did the Kennedy administration respond to the Cuban Missile Crisis?

Which political philosophy emphasizes the importance of group identities in shaping political agendas?

What was a significant domestic challenge faced by Jimmy Carter during his presidency?