A chemistry graduate student is studying the rate of this reaction:

2NH3g+N2g3H2g

He fills a reaction vessel with NH3 and measures its concentration as the reaction proceeds:

time (minutes) NH3 0 0.100M 1.0 0.0375M 2.0 0.0230M 3.0 0.0166M 4.0 0.0130M

Use this data to answer the following questions.

Write the rate law for this reaction. rate =k NH3

Calculate the value of the rate constant k . Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol. =k ×10