Which condition applies when water boils at 100°c? air pressure equals a specific value (101.3 kpa) air pressure is less than its value at the triple point of water air pressure is zero, as in a vacuum vapor pressure is zero

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.