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Jadi reaksinya, CH4+2 O2 --> CO2 + 2 H2O
∆Hreaksi = ∑∆f sesudah - ∑∆f sebelum
∆Hreaksi = [ CO2 + 2 H2O ] - [ CH4 + 2 O2]
= -393,5 + 2. (-241,8) - (-84)+ 0
= -393,5 + (-483,6)+84
= -877,1+84
= -793,1 kJ/mol
Semoga membantu, untuk nomor 6 saya belum pelajari.