1. For the gas phase decomposition of nitrosyl chloride at 400 K, the rate of th

Question

1.

For the gas phase decomposition of nitrosyl chloride at 400 K, the rate of the reaction is determined by measuring the disappearance of NOCl.

At the beginning of the reaction, the concentration of NOCl is 8.88×10-2 M. After 518 min the concentration has dropped to 3.38×10-2 M.

What is the rate of the reaction?    (mol NOCl/L) /min

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2.

For the gas phase decomposition of nitrosyl chloride at 400 K , the rate of the reaction is determined by measuring the appearance of Cl2.

At the beginning of the reaction, the concentration of Cl2is 0 M. After 524 min the concentration has increased to4.10×10-2M.

What is the rate of the reaction?    (mol Cl2/L) / min

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Explanation / Answer

ans 1

Rate = disappearance of [NOCl] = - 1/2 ( [NOCl]2 - [NOCl]1 ) / ( t2 -t1 )

= - 1/2 (3.38×10-2 - 8.88×10-2 ) / 518

= 5.31 x 10-3 M / min

ans 2

Rate = appearance of [Cl2] = ( [Cl2]2 - [Cl2]1 ) / ( t2 -t1 )

= (4.10×10-2 - 0 ) / 524

= 7.82 x 10-3 M / min

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