For first order reaction ,
T = time period
K = rate constant
A° = initial conc.
At = final conc.
T=2.303 / K * [ log A° / At ]
= 2.303 / 0.13 * [ log 0.8/ 0.27 ]
= 2.303 / 0.13 * log ( 2.96 )
= 2.303 * 0.47 / 0.13 sec
= 8.35 sec ( answer )
stion 13 of 18 > The rate constant for this first-order reaction is 0.130 s-at 400...
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t Score: 35% Resources 1 Give Up? Hint Check of 30 > The rate constant for this first-order reaction is 0.650 s-at 400°C. A - products How long, in seconds, would it take for the concentration of A to decrease from 0.980 M to 0.280 M? contact help terms of Use privacy policy about us Careers 5 - 1 e ôO OW
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