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

question 148

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 M^-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