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SCH4U Hess's Law Hess's Law Worksheet - awesomeness.ca Flipbook PDF
SCH4U Hess's Law Hess's Law Worksheet 1. Calculate L1H for the reaction: C 2 H 4 (g)+ 2 (g)~C H 6 (g), from foll
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SCH4U Hess's Law
Hess's Law Worksheet 1. Calculate L1H for the reaction: C2H4 (g)+ H2 (g)~C 2 H 6 (g), from the following data. C2H4 (g)+ 3 02 (g) ~2 C02 (g)+ 2 H20 (I)
L1H = -1411. kJ
C2H6 (g) + 3Yz 02 (g) ~2 C02 (g) + 3 H20 (I)
L1H = -1560. kJ L1H
2.
3.
4.
=-285.8 kJ
Calculate L1H for the reaction 4 NH 3 (g)+ 5 0 2 (g) 1111114 NO (g)+ 6 H20 (g), from the following data. N2 (g) + 02 (g) ~2 NO (g)
L1H = -180.5 kJ
N2 (g)+ 3 H2 (g) ~2 NH3 (g)
L1H
=-91.8 kJ
2 H2 (g) + 02 (g) ~2 H20 (g)
L1H
=-483.6 kJ
Find L1H for the reaction 2H 2(g) + 2C(s) + 0 2(g) ~ C2H5 0H(I), using the following thermochemical data. C2H 5 0H (I)+ 2 0 2 (g) ~2 C02 (g)+ 2 H20 (I)
L1H = -875. kJ
C (s) + 02 (g) ~C02 (g)
L1H = -394.51 kJ
H2 (g) + Yz 02 (g) ~H20 (I)
L1H = -285.8 kJ
Calculate li!H for the reaction CH 4 (g)+ NH 3 (g) ~HCN (g)+ 3 H2 (g), given: N2 (g)+ 3 H2 (g) ~2 NH3 (g)
L1H = -91.8 kJ
C (s) + 2 H2 (g) ~CH4 (g)
L1H = -74.9 kJ
H2 (g) + 2 C (s) + N2 (g) ~2 HCN (g)
L1H
=+270.3 kJ
SCH4U Hess 's Law 7. Given the following reactions and their enthalpy changes, calculate the enthalpy change for
I Change in Heat Energy
j Equations N2(g) + 2 02(g) ~ 2 N02(g)
67.8 kJ
Nz(g) + 2 02(g) ~ N204(g)
9.67 kJ
8. Given the following reactions and their enthalpy changes, calculate the enthalpy change for
IChange in Heat Energy
!Equations i
] Ca(g) + 2 C(s) I
~ CaC2(S)
ICaC03(s) + C02(g) ~ CaC2(s) + 5/2 02(g)
1
-62.8 kJ
1
394 kJ
1
1538 kJ
9. Calculate the heat change for the formation of l.OOmol of strontium carbonate from its elements. Given the following experimental information:
1 Sr(s)+-02 (g) 2 SrO(s) + C0 2 (g)
~
SrO(s)
/ill = -592kJ
~
SrC0 3
11H = -234kJ
C(graphite) + 0 2 (g)
~
C02 (g)
/ill= -394kJ
10. Calculate the D. Ht for 6 C(s) + 6 H2 (g) + 3 0 2 (g) -------tC6H12 06 (s) given that: C6H1206 (s) + 6 Oz (g) >6 C02 (g)+ 6 H20 (g) ~He= -2537.3 kJ Hz (g) + 1/2 02 (g) ~H20 (g) D,. Ht = -241.8 kJ 0 C (s) + 02 (g) ~ C02 (g) ~Ht = -393.5 kJ
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