Regents Chemistry Exam August 2024 Question 48
48 Given the balanced equation representing a reaction:
C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) + energy
The mole ratio of oxygen molecules to carbon dioxide molecules is
(1) 1:2 (3) 3:2
(2) 1:3 (4) 3:3
Solution:
The ratio of molecules in a balanced equation is given by the coefficients in the equation. The coefficient for oxygen is 3 and the coefficient for carbon dioxide is 2. Therefore, the ratio of oxygen molecule to carbon dioxide molecules is 3:2. Choice 3 is the correct answer.
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