The volume of NO₂ liberated = 3 L
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Avogadro's hypothesis states that:
In the same temperature and pressure, in the same volume conditions, the gas contains the same number of molecules
So it applies: the ratio of gas volume will be equal to the ratio of gas moles
Given
3 L of NO
Required
The volume of NO₂
Solution
Reaction
2NO + O₂ → 2NO₂
The reaction occurs at STP, then the reaction occurs at the same temperature and pressure (0 C, 1 atm)
We use the Avogadro formula
[tex]\tt \dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex]
1 = NO, 2 = NO₂
mol ratio NO : NO₂ from the equation : 2 : 2, so :
[tex]\tt \dfrac{3~L}{2}=\dfrac{V~NO_2}{2}\\\\V~NO_2=\dfrac{3\times 2}{2}\\\\V~NO_2=\boxed{\bold{3~L}}[/tex]
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