Reaction Rate: Can someone show me how to do these 34. Consider the reaction: 2

Question

Reaction Rate:

Can someone show me how to do these

34. Consider the reaction: 2 H2O2(aq)- 2H20() + 02(g) h below shows the concentration of H202 as a function The grap of time. 1.2 H2021] 0.6 0.4 0.2 0 10 20 30 40 50 60 70 80 Time (s) Use the graph to calculate each quantity: a. the average rate of the reaction between 10 and 20 s b. the insta c. the instantaneous rate of formation of O2 at d. If the initial volume of the H,0, is 1.5 L, what total amount 50 s of O2 (in moles) is formed in the first 50 s of reaction?

Explanation / Answer

a)

average rate between 20 and 10

avg. rate = (Cfinal - Cinitial) / (tfinal - tinial)

avg. rate = (0.55-0.75)/(20-10) = -0.02M/s

b)

instantaneous rate -->

Rate = k*[H2O2]

at t = 30s, [H2O2] = 0.4

then

1/C = 1/C0 + kt

1/0.4 = 1/1 + k*30 --> k = (1/0.4 - 1/1)/30 = 0.05

Rate = k*[H2O2] = 0.05*0.4= -0.02 M/s

c

rate of O" formation at 50 s

t = 50s, then [H2O2] = 0.21

Rate = k*[H2O2] = 0.05*0.21= 0.0105 M/s

this is H2O2, then formation of O2 = 1/2*0.0105

Rate of formation O2 = 0.00525 M/s

d.

initial H2O2= mol = MV = 1.5*1 = 1.5 mol

at t = 50s, H2O2 = 0.21 M --> mol = MV = 0.21*1.5 = 0.315 mol left

mol of H2O2 reacted = 1.5-0.315 = 1.185

mol of O2 = 1/2*1.185

mol of O2 = 0.5925 mol frmed

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