How could you use iron oxide to prepare iron nitrate?

Nonmetal halogen family atmoic mass 35

Summarize possible ways in which phases of matter could combine to form a solution.

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.