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

He fills a reaction vessel with H ₃ PO ₄ and measures its concentration as the reaction proceeds:

Use the data to answer the following questions.

time (minutes) 0 1.00 2.00 3.00 4.00 [HPO4] 0.030 M 0.018 M 0.011 M 0.0067 M 0.0041 M Write the rate law for this reaction. 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. rate = 0 k = 0