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N-19
B.
Determination of ?H
7
: (Your graph for this part must be attached.)
Results
Volume of HCl
mL
Mass of MgO
g
?t
°C
Heat absorbed by water
J
Amount of MgO
moles
?H
7
per mol of MgO
kJ/mol
Show detailed calculations for the heat absorbed by the water in this reaction, and of ?H
7
.
Include the calculations for ?t. (0.6 marks)
C.
Calculate ?H
f
of H2O
(l)
from your measured values of ?H
6
and ?H
7
, and given
?H
8
= -601.7 kJ/mol. Include the appropriate net ionic equations. (0.7 marks)
