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The heat of combustion of CH4 (g) at constant volume is measured in a bomb calorimeter at 298.2K and found to be - 885389J/mol. Find the value of enthalpy change.

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how is delta ng = -2????
 
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How delta Ng is -2???
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How ∆n can be -2? If you write the equation of the reaction you will get CH4 +2O2 -------> CO2 + 2H2O If you see the equation then you will find total no. of moles in product is 2+1=3 and total no. of moles in reactants is 1+2=3. So ∆n = 3-3 = 0 So, how did you get ∆n = -2 ?
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