The heat of combustion of CH4,graphite and H2 are respectively 20 k.cal,-40 k.cal& -10 k.cals.The heat of formation of CH4 is
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The enthalpy change for this reaction at 1 atm is equal to (a) -2AH,° [NaN3 (s)] (b) +2AH,° ... is 1 7k cals at 27°C. Assuming R = 2 cal K" 1 mol', the value of AH for the above
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