June 2017 NY Regents Chemistry Exam
36 Given the balanced equation representing a reaction: 2NO + O2 → 2NO2 + energy
The mole ratio of NO to NO2 is
(1) 1 to 1
(2) 2 to 1
(3) 3 to 2
(4) 5 to 2
Solution: The coefficients in the equation represent mole ratios. The coefficient for NO is 2 and for NO2 is 2. The mole ratio would be 2 to 2 or 1 to 1 when simplified.
Answer: 1
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