1. : Fe2O3() + 3H2() = 2Fe() + 3H2O()
. ,
: ΔrG = ΣΔfG0 ΣΔfG0
.11 []
Fe2O3() | H2() | Fe() | H2O() | |
, / | 740,3 | 228,6 |
ΔrG = (2∙0 + 3∙-228,6) (1∙-740,3 + 3∙0) = 54,5 /.
.. ΔrG > 0, .
2. Dr0, DrS0 DrG0
()+ 2() = 3(),
298 . DG0 ?
. , , , ΔrG < 0.
1 (2), , , , .. ΔrS <0.
Dr0, DrS0 DrG0 :
ΔrG0 = ΔrH0 TΔrS0,
: Dr<0.
.. , DrG , .
3. :
66 () + NO3 () = 65NO2() + 2 ()?
, .
. :
Dr0 DrS0 :
ΔrH = ΣΔfH0 ΣΔfH0
ΔrS = ΣS0 ΣS0,
11 []:
66 () | NO3 () | 65NO2() | 2 () | |
, / | 49,03 | -173,00 | 15,90 | 285,83 |
, / | 173,26 | 156,16 | 224,26 | 69,95 |
ΔrH = (15,90-285,83) (49,03-173,00) = -145,70
ΔrS = (224,26+69,95) (173,26+156,16) = -35,21 / = -0,035 / .
.
(Dr<0), (- ΔrS >0), , :
ΔrG0 = ΔrH0 TΔrS0,
>4162 (ΔrG > 0), <4162 - (ΔrG < 0).