If the decomposition of HI (g) into H 2 (g) and I 2 (g) is known to be second or

Question

If the decomposition of HI (g) into H2 (g) and I2 (g) is known to be second order with respect to HI:

a) Write a balanced chemical equation for this reaction. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /?>

b) Write the rate law for this reaction.

c) When the concentration of HI is 2.50 M, the rate of decomposition is 1.58 x 10-2 M/s. Calculate the value and units of the rate constant.

d) What is the rate of this reaction when the concentration of HI is 1.50 M?

Explanation / Answer

a)
HI(g)-->1/2 H2(g)+1/2 I2(g)
b)
Rate=k[HI]
C)
Rate=k[HI]
1.58 x 10-2 M/s=K*2.50 M
K=0.672 x 10^-2 /s
d)
Rate=k[HI]
rate=0.672 x 10^-2 /s*1.50 M
K=1.008 x 10^-2 M/s

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