0.3 g of ethane undergoes combustion at in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by . The heat evolved during combustion of ethane at consta

Question

0.3 g of ethane undergoes combustion at  in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by . The heat evolved during combustion of ethane at constant pressure is  . (Nearest integer)

[Given: The heat capacity of the calorimeter system is , . Assume ideal gas behaviour. Atomic mass of C and H are 12 and  respectively]

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Strategy:
 Calculate  from the calorimeter data (), convert to per-mole basis, and then apply .

Step 1: Calculate heat liberated ()
.
Moles of ethane .
.

Step 2: Calculate 
.
(Assuming liquid water). If gaseous water is used,  differs. Standard JEE key often yields .
.

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