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Under certain conditions the rate of this reaction is zero order in ammonia with a rate constant of 0.0016.M1 : : 2NH3(g)N2(g)+3H2(g) Suppose a 2.0L flask is charged under these conditions with 350 , mmol of ammonia. After how much time is there only 175 , thmol 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