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19 August, 15:39

How many moles of H2O can be formed when 4.5 moles of NH3 react with 3.2 moles of O2? NH3 + O2 yields NO + H2O

A. 3.8 mol H2O

B. 4.8 mol H2O

C. 6.4 mol H2O

D. 6.8 mol H2O

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Answers (1)
  1. 19 August, 16:07
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    4 NH3 + 5 O2 = 4 NO + 6 H2O

    the ratio between NH3 and O2 is 4 : 5

    moles O2 required = 4.5 x 5 / 4 = 5.6

    because we have only 3.2 moles of O2 this is the limiting reactant

    the ratio between O2 and H2O is 5 : 6

    moles H2O = 3.2 x 6 / 5 = 3.8
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