Kpl.5.2

5.12
a ja c

5.13
a)
$Fe_2O_3+2Al\rightarrow Al_2O_3+2Fe$

$\Delta H=-1670-\left(-822{,}2\right)=-847{,}8kJ$
b)

$C_2H_4\rightarrow C_2H_6$

$\Delta H=-84{,}7-52{,}3=-137kJ$
c)

$CaO+CO_2\rightarrow CaCO_3$

$\Delta H=-1206{,}9-\left(-635{,}6+\left(-393{,}5\right)\right)=-176{,}5kJ\approx177kJ$
d)