The acetylene tank contains 35.0 mol c2h2, and the oxygen tank contains 84.0 mol o2. how many moles of o2 are needed to react completely with 35.0 mol c2h2? o2

 The moles   of O2 that are needed to react  completely  with 35.0  mol C2H2 is 87.5 moles  of O2

 Explanation

Write a balanced chemical  equation  for reaction of between C2H2 and O2

2 C2H2 + 5O2 →  4 CO2   + 2 H2O

if 35.0 moles C2H2  reacted then  use  the o mole ratio  to determine  the moles  of C2H2

The mole ratio  of C2H2 :O2 = 2:5 therefore the   moles of O2

=  35 moles x5/2  =  87.5 moles of O2

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