▁energy ▁describes ▁the ▁energy ▁transformation : ▁ ▁Pres ently , ▁ 7 5 ▁tons ▁of ▁raw ▁sugar ▁can e ▁are ▁produced ▁ann ually ▁per ▁hect are ▁in ▁Brazil . ▁The ▁can e ▁delivered ▁to ▁the ▁processing ▁plant ▁is ▁called ▁burn ed ▁and ▁cro pped ▁( b & c ), ▁and ▁represents ▁ 7 7 % ▁of ▁the ▁mass ▁of ▁the ▁raw ▁can e . ▁The ▁reason ▁for ▁this ▁reduction ▁is ▁that ▁the ▁stal ks ▁are ▁separated ▁from ▁the ▁leaves ▁( which ▁are ▁burn ed ▁and ▁whose ▁as hes ▁are ▁left ▁in ▁the ▁field ▁as ▁fert il izer ), ▁and ▁from ▁the ▁roots ▁that ▁remain ▁in ▁the ▁ground ▁to ▁spr out ▁for ▁the ▁next ▁c rop . ▁A verage ▁can e ▁production ▁is , ▁therefore , ▁ 5 8 ▁tons ▁of ▁b & c ▁per ▁hect are ▁per ▁year . ▁Each ▁ton ▁of ▁b & c ▁yields ▁ 7 4 0 ▁kg ▁of ▁ju ice ▁( 1 3 5 ▁kg ▁of ▁suc rose ▁and ▁ 6 0 5 ▁kg ▁of ▁water ) ▁and ▁ 2 6 0 ▁kg ▁of ▁mo ist ▁bag asse ▁( 1 3 0 ▁kg ▁of ▁dry ▁bag asse ). ▁Since ▁the ▁lower ▁he ating ▁value ▁of ▁suc rose ▁is ▁ 1 6 . 5 ▁M J / kg , ▁and ▁that ▁of ▁the ▁bag asse ▁is ▁ 1 9 . 2 ▁M J / kg , ▁the ▁total ▁he ating ▁value ▁of ▁a ▁ton ▁of ▁b & c ▁is ▁ 4 . 7 ▁G J ▁of ▁which ▁ 2 .