t 0.00 2.00 4.00 6.00 8.00 10.00 12.00 | 14.00 (hr) [X2] 0.250 | 0.213 0.182 | 0.155 0.133 | 0.113 0.097 | 0.082 a. Determine the rate constant for this reaction. b. How much X2 is left if 0.457 M of the gas is allowed to decompose

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