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Calculati cantitatea de caldura care se degaja la arderea a 6,4 g metan stiind ca DHch4=-802kj/mol

Răspuns :

MCH4=12+4*1=16g/mol
1mol metan.......16g........802kJ
...........................6,4g............xkJ
x=6,4*802/16=320,8kJ