Given the following equation, 2 N2 + 5 O2 → 2 N2O5, 1.25 moles of nitrogen requires ________ moles of oxygen. A. 0.500 B. 1.75 C. 3.13 D. 1.56

Given the following equation, 2 N2 + 5 O2 → 2 N2O5, 1.25 moles of nitrogen requires ________ moles of oxygen.
A. 0.500
B. 1.75
C. 3.13
D. 1.56

Answer

• C. 3.13
  Explanation:
  Given the following equation, 2 N2 + 5 O2 → 2 N2O5, 1.25 moles of nitrogen requires ________ moles of oxygen.
  2 N2 + 5 O2 → 2 N2O5
  Mole ratio
  N : O
  2 moles of Nitrogen : 5 mole of Oxygen
  1.25 moles of Nitrogen : ?
  If 2 moles of nitrogen according to the balanced chemical equation reacts with 5 moles of oxygen, the 1.25 moles of nitrogen will react as follows:
  1.25 moles * 5 moles / 2 moles = 3.125 moles or 3.13 moles ( 2 d.p)

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