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The reaction 2NO2+O2-->2NO2. NO is second order in O2 and first order in . When [NO]= 4.0×10^-2M and [O2]= 2.5×10^?2M , the observed rate of disappearance of NO is 9.8×10^?5 M/s. What is the rate constant? what would happen if you increase the concentration of NO by a factor of 1.9?

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