Suppose a 300.mL ⁢ flask is charged under these conditions with  500.mmol of hydrogen iodide. After how much time is there only  250.mmol left? You may assume no other reaction is important. Be sure your answer has a unit symbol, if necessary, and round it

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Under certain conditions the rate of this reaction is zero order in hydrogen iodide with a rate constant of

·0.0040Ms−1:2HI(g)→H2(g)+I2(g)
 
Suppose a 300.mL ⁢ flask is charged under these conditions with 
500.mmol of hydrogen iodide. After how much time is there only 
250.mmol left? You may assume no other reaction is important. Be sure your answer has a unit symbol, if necessary, and round it to
2 significant digits.

 

Expert Solution
Step 1

The reaction is 

2HI(g)→H2(g)+I2(g)

Half life time = Co/2k

The rate equation is 

Co =Ct +nkt      ......... (1)

Initially the moles is 500 mmol of hydrogen iodide at time (t) the remaining moles are 250mmol.

Half life time is the time in which the half of the reactant molecule is consumed or left in the solution. 

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