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6,72 liter? -> dH?
mol Karbon = V/22,4 (STP)
mol Karbon = 6,72/22,4 = 0,3 mol
dH= 0,3mol x 394 kJ/mol = 118,2 kJ
2.dHr= dHf produk - dHfreaktan
dHr= ( 3x(-395) + 4x(- 286) - (1x(-104)))
dHr=-2225 kJ/mol -> untuk 1 mol C3H8
2,2 gram? -> dHr?
mol C3H8=gr/Mr=2,2/44=0,05 mol
dHr= 0,05mol x -2225kJ/mol=-111,25 kJ