Home
Class 11
CHEMISTRY
4.184g of benzoic acid was burnt in bomb...

4.184g of benzoic acid was burnt in bomb calorimeter. The rise in the temperature is `10^@`. The heat capacity of calorimeter and its contents is `2.644 kcal K^(-1)`. Calculate the heat of combustion of benzoic acid. 

Text Solution

Verified by Experts

The heat of combustion `=- (h xx q xx M) //m` Rise in temperature of calorimeter and its contents, `theta = 10^(@)`
The heat capacity of calorimeter and its contents,`=2.644 xx 4.184 J K ^(-1)` The mass of combustible substance, (benzoic acid), m=4.184g. The molar mass of benzoic acid, `M = 122 g mol ^(-1).`
The heat of combustion of benzoic acid
`= - (2.644 xx 4.184 xx 10 xx 122 )/(4.184) =-3226 kJ mol ^(-1).`
Promotional Banner

Similar Questions

Explore conceptually related problems

Heat of combustion of benzoic acid (C_6H_5COOH) at constant volume at 25^@C is -3233KJ//"mole" . When 0.5g of benzoic acid is burnt in bomb calorimeter, the temperature of calorimeter increased by 0.53^@C . Now in the same bomb calorimeter 1g of C_2H_6 burnt then temperature increased by 2.04^@C . DeltaH for combustion of C_2H_6 is

The amount of heat evolved on combustion of 10 grams of benzoic acid is 10 K.Cals. The heat of combustion of benzoic acid is

A sample of CH_(4) of 0.08g was subjected to combustion at 27^(@)C in a bomb calorimeter. The temperature of the calorimeter system was found to be raised by 0.25^(@)C . If heat capacity of calorimeter is 18 kJ//""^(@)C, Delta H for combustion of CH_(4) at 27^(@)C is

A calorimeter takes 200 cal of heat to rise its temperature through 10^(@) C. Its water equivalent in gm is

The heat of combustion of solid benzoic acid at constant volume is -321.30 KJ at 27^(@) C . The heat of combustion at constant pressure is

When 1.0g of oxalic acid (H_(2)C_(2)O_(4)) is burned in a bomb calorimeter whose heat capacity is 8.75kJ/K, the temperature increases by 0.312K. The enthalpy of combustion of oxalic acid at 27^(@)C