# Problem: A student studied the kinetics of the reaction  C2H4(g) → C2H2(g) + H2(g)  by monitoring the C2H4 concentration (in moles/L) as a function of time. The student made a plot of ln [C2H4] against t. The plot was a straight line with the equation y = −0.618x − 1.427 (where y = ln [C2H4] and x = t). What was the initial C 2H4 concentration? a) 0.62 moles/L b) 4.17 moles/L c) 0.24 moles/L d) 0.78 moles/L e) 1.62 moles/L

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###### Problem Details

A student studied the kinetics of the reaction

C2H4(g) → C2H2(g) + H2(g)

by monitoring the C2H4 concentration (in moles/L) as a function of time. The student made a plot of ln [C2H4] against t. The plot was a straight line with the equation y = −0.618x − 1.427 (where y = ln [C2H4] and x = t). What was the initial C 2H4 concentration?

a) 0.62 moles/L

b) 4.17 moles/L

c) 0.24 moles/L

d) 0.78 moles/L

e) 1.62 moles/L

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Our tutors have indicated that to solve this problem you will need to apply the Identifying Reaction Order concept. If you need more Identifying Reaction Order practice, you can also practice Identifying Reaction Order practice problems.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Reck's class at IU.