norder to determinethe rate a forthe decomposition of hydrogen peroxide, a stude

Question

norder to determinethe rate a forthe decomposition of hydrogen peroxide, a student collected pressure versus time measurements as the hydrogen peroxide decomposed with the addition of KI. The following graph was produced at 20 °C m S Pressure vs. Time y = 0.1701x + 19.37 R2 = 0.8928 45 35 30 25 20 10 20 60 100 120 140 Time (s) 410 14 80 15.bS9b Based upon the student's data, what is the initial rate of the reaction in mot + jq Les A. 7.07 x 10-3 mo 1.36 x 10 , C. 1.36× 10 mol Les B. mol Ls 9.31 x 10 0.1701 mol L S

Explanation / Answer

OPTION D

Take the reaction to be 0 order because the unitts of reaction are mentioned. You should not see the positive slope of the reaction as this is pressure slope, pressure of the system can increase as H2O2 decomposes into other products giving more molecules, Since P is proportional to X ( no of moles) the rate of change of P is your rate of the reaction, that is the correct answer is OPTION D as the rate is the slope of the graph which given to be 0.1701.

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