Astudent dissolves 0.0688 mol of sodium hydroxide in water to make a 0.250 l solution. what is the molarity of the solution?
a.0.17 m
b.0.28 m
c.2.5 m

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.