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.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)