Use the Standard Reaction Enthalpies Given Below to Determine $D _ { \mathrm { r } }$

question 62

Multiple Choice

Use the standard reaction enthalpies given below to determine $D _ { \mathrm { r } }$ H° for the following reaction: 2NO(g) + O₂(g) ? 2NO₂(g) _DrH°= ?
Given:
N₂(g) + O₂(g) ? 2NO(g) _DrH°= +183 kJ
1/2 N₂(g) + O₂(g) ? NO₂(g) _DrH°= +33 kJ

• A)-150.kJ mol^-1
• B)-117 kJ mol^-1
• C)-333 kJ mol^-1
• D)+115 kJ mol^-1
• E)+238 kJ mol^-1

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