Question

小香

求這兩題如何解

6.已知C (s)+O2(g) → CO2(g) AH=-400kJ
2H2(g)+O2(g)→2H2O()
C2H5OH()之莫耳燃燒熱為-1380kJ,則 C2H5OH()之莫耳生成熱為何?
DCH
【答】
(A)-380 (B)+100 (C)-180 (D)-140kJ/mol
C2H5OH
+ 02
C₂1504
AH=-480kJ
240
(1
Wz +420
【87.北
H2O+CO2
7.已知 CH4(g)之莫耳生成熱為-75kJ; H2O(l)之莫耳生成熱為-287kJ; C (s)之莫耳燃燒熱為
394kJ;則4H2(g) + CO2(g) → CH4(g)+2H2O(1)
(A)255 (B)-255 (C)32 (D)-32
【答】
-740784
+
之△H= ? kJ
(+(-394)-75-284x2
-45-28412-
(2
【答