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H2+1/2O2---->H2O AH=-258
C2H2+2O2---->2CO2+H2O AH=-786
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C2H2+5/2O2---->2CO2+H2O AH=-1271
0,52gr C2H2
molC2H2=0,52/6=0,02mol
jumlah kalor pbkrn 0,52gr C2H2 adl
=0,02 x -1271=-25,42 kj/mol