Mendeleev fixed an apparent discrepancy in the order of his periodic table by reversing the placement of which two
elements?
a
nickel and copper
b cesium and barium
c
a Hint?
tin and antimony
d tellurium and iodine
Its D

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.