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mol ch4 = massa/mr
= 8g/16 = 0,5 mol
0.5 mol x -1,780 = -890kj
dit : deltaH 8 g CH4?
jaw :
mol CH4= massa/ Mr
= 8 g/ (12+4)
= 8 g/ 16
= 0,5 mol
kalau dalam 1 mol jadi:
CH4 + O2 ----> CO2 + H2O delta H0c= - 0,89 kJ/mol
berarti karena dalam 0,5 mol maka :
delta H atau entalpi = 0,5 mol x delta H0C
= 0,5 mol x - 0,89 kJ/mol
= -0,445 kJ