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Why the Qb(bomb calorific value) should minus 40J to get the calorific value of benzoic acid?

As described in ASTM D5865-2010, the nitric acid correction for a 340-ml oxygen bomb is found to be 41.9J(10.0 calories) when the released energy corresponds to that liberated by one gram of benzoic acid.26.45KJ. for more details pls refer to ASTM D5865