A chemistry graduate student is studying the rate of this reaction: H2CO3(aq) →H2O(aq)+CO2(aq)

He fills a reaction vessel with H2CO3 and measures its concentration as the reaction proceeds:

time (minutes) H2CO3

0 0.100M

1.0 0.0435M

2.0 0.0278M

3.0 0.0205M

4.0 0.0162M

write the reate law for this reaction: k ?

calculate the value of the rate constant k. Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbols.