Nitrogen Dioxide Decomposes at 300 °C Via a Second-Order Process

question 105

Multiple Choice

Nitrogen dioxide decomposes at 300 °C via a second-order process to produce nitrogen monoxide and oxygen according to the following chemical equation:
2 NO₂(g) → 2 NO(g) + O₂(g) .
A sample of NO₂(g) is initially placed in a 2.50 L reaction vessel at 300 °C.If the half-life and the rate constant at 300 °C are 11 seconds and 0.54 L mol^-1 s^-1,respectively,how many moles of NO₂ were in the original sample?

• A)0.17 mol
• B)0.42 mol
• C)5.9 mol
• D)15 mol

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