Is the reaction si (s) + 2 h2 (g) --> sih4 (g) spontaneous under standard conditions at 298 k? answer this question by calculating delta-s(universe). the "system" is comprised of the reactants and products. a. what is delta-s(universe)?

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.