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In an experiment, \(4.5\) kg of a fuel was completely burnt. The heat produced was measured to be \(180,000\) kJ. Calculate the calorific value of the fuel.
  
\(\text{Calorific value}\) \(=\) \(\frac{\text{X}}{\text{Y}}\)
 
Where,
 
X is
 
Y is
 
\(=\) \(40,000\) kJ/kg.