The heat of combustion of solid benzoic acid at constant volume is at . The heat of combustion at constant pressure is . The value of is .

Question

The heat of combustion of solid benzoic acid at constant volume is  at . The heat of combustion at constant pressure is . The value of  is .

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Strategy:
 Use the thermodynamic relationship . Calculate  by considering only the gaseous species in the balanced combustion equation.

Step 1: Write the balanced combustion equation

Step 2: Calculate

.

Step 3: Relate  and

Given:  and .
.

Step 4: Identify 
Comparing with : .

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