Question

The reaction I2(g) +SiH4(g) -------> HI(g) +SiH3I(g) is first order in both I2 and SiH4, with...

The reaction

  • I2(g) +SiH4(g) -------> HI(g) +SiH3I(g)

is first order in both I2 and SiH4, with k = 2.14 L mol-1 s-1 at 255°C. If 1.00 L of I2(g) at a concentration of 2.44×10-3 M is rapidly mixed with the same volume of SiH4(g) also at a concentration of 2.44×10-3 M, what is the time (in seconds) required for the I2 concentration to decrease to a value of 3.38×10-4 M?

HINT: Because the reaction conditions and stoichiometry are such that the concentrations of the two reacting species are always equal, the integrated rate law for the reaction is:

1/C = 1/c0 + kt

where c and c0 represent concentrations of either of the reactants.

___________ s

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