# REALLY REALLY NEED THESE ANSWERS!! Please?Help! I promise 10 points!?

Info you'll need to solve:

H2(g) + I2(g) --> 2HI(g) Rate = k[H2][I2]

[I2] (M) ... time (s)
0.1 .... 0
0.0956 ... 100
0.0916 ... 200
0.0879 ... 300

Questions:

a. Write the rate equations for the relative rate of dissappearance of hydrogen gas and iodine and the appearance of hydrogen iodide.

b. If the rate of dissappearance of iodine vapor is 0.0250 M/s, what is the rate of appearance of hydrogen iodide?

c. What is the rate of disappearance of iodine vaper between 0s and 100s?

d. the rate constant for the reaction was found to be 0.00450 M^-1 s^-1. What is the instantaneous rate of reaction when the concentration of iodine vapor and hydrogen gas are both 0.100 M?

Answer:
a. Write the rate equations for the relative rate of dissappearance of hydrogen gas and iodine and the appearance of hydrogen iodide.

H2(g) + I2(g) + C3(g) -> H1(g) + C4(h) + I1(g)

b. If the rate of dissappearance of iodine vapor is 0.0250 M/s, what is the rate of appearance of hydrogen iodide?

0.0015 M/s

c. What is the rate of disappearance of iodine vaper between 0s and 100s?

22s

d. the rate constant for the reaction was found to be 0.00450 M^-1 s^-1. What is the instantaneous rate of reaction when the concentration of iodine vapor and hydrogen gas are both 0.100 M?

0.0003255s
LOL you need a teacher to solve D and C i only can A and B sorry!!!
Eugh, chemistry, why did I study this shite
Really could use the points, but damned if i know!
dont know ill send them to a friend that might be able to help
ugh.........
oh no..
a. First of all you need to graph the data, [I2], M vs. time (sec), to determine if the disappearance of I2 with respect to time is zero, first, second, or whatever order. Graph it and do a best fit of the line. Do it linearly (first order) or use a polynomial curve (in Excel...). I will tell you that one of them gave me an R value of 1. Use that order to determine the order of the reaction with respect to I2. It will be the same for H2. Twice that, and negative of it, for the appearance of HI.
YOU MUST DO THE GRAPH! That's part of the homework problem.

b. rate (HI appearance) = -2 * rate I2 disapp. (you do the math)

c. This answer depends on correct graphing and getting correct line formula from part a. Take the expression for the line that you got in (a), take the first derivative of it and evaluate it at 50. This is like taking the slope of the line segment between t = 0 and 100 at its midpoint. (Simple calculus)

d. You are told the rate expression, rate = k[H2][I2] at the beginning of the problem. Now plug in the instantaneous values you were just given in Part d. H2 = I2 = 0.100 M,
k = 0.00450 / M-sec

rate (inst) = k[H2][I2] = (0.00450 / M-sec)(0.100M)(0.100M)
= 0.0000450 M/sec (look how the units cancel!)

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