How many moles are 21.67 L of NH4CI?
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0.967mole

Explanation:

Given parameters:

Volume of NH₄Cl  = 21.67L

Unknown:

Number of moles  = ?

Solution:

We assume that the volume was taken at standard temperature and pressure,

 Then;

  Number of moles  =  

 Number of moles  =   = 0.967mole

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.