From the following heats of combustion ch 3 ohl 32o 2

10.
From the following heats of combustion,
CH
3
OH(l) + 3/2O
2
(g) → CO
2
(g) + 2H
2
O( l ) ΔH o
rxn
= –726.4 kJ/mol
C(graphite) + O
2
( g ) → CO
2
( g ) ΔH
rxn
= –393.5 kJ/mol
2
( g ) + ½O
2
( g ) → H
2
O( l ) o
rxn
= –285.8 kJ/mol
Calculate the enthalpy of formation of methanol (CH
3
OH) from its elements.
o
H ΔH
11.
Methanol (CH
3
OH) is an organic solvent and is also used as a fuel in some automobile
engines. From the following data, calculate the standard enthalpy of formation of
methanol:
(5 points)
12.
A 44.0 g sample of unknown metal at 99.0 °C was placed in a constant-pressure
calorimeter, with a heat capacity of 12.4 J/°C, containing 80.0 g of water at 24.0°C.
The final temperature of the system was found to be 28.4 °C. Calculate the specific
heat of the metal. (10 points)
4
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