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Question

Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by q then the numerical value of q depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.

The heat capacity of a bomb calorimeter is 300 J/K. When 0.16 gm of methane was burnt in this calorimeter, the temperature rose by 3 C. The value of ΔU per mole will be:
  1. 100 kJ
  2. 90 kJ
  3. 900 kJ
  4. 48 kJ


Solution

The correct option is B 90 kJ
Given data:
C=qΔT=300J/K
Reaction:
CH4+2O2CO2+2H2O
foe given mole of methane (0.16/16=0.01) mole
300=q3
q=900J
so for one mole of methane
q=900×10.01=90kJ

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