If 95 grams of Iron are needed to react with sulfur, how many grams of sulfur are involved in this reaction? 2 Fe + 3 S=Fe2S3

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.