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WorksheetsUjian 3 Termodinamika
Total questions: 6
Worksheet time: 7mins
A 5.000 g sample of methanol, CH3OH, was combusted in the presence of excess oxygen in a bomb calorimeter conaining 4000 g of water. The temperature of the water increased from 24.000 oC to 29.765 oC. The heat capacity of the calorimeter was 2657 J/oC. The specific heat of water is 4.184 J/goC. Calculate E for the reaction in kJ/mol.
-314 kJ/mol
-789 kJ/mol
-716 kJ/mol
-121 kJ/mol
-69.5 kJ/mol
The entropy will usually increase when
I. a molecule is broken into two or more smaller molecules.
II. a reaction occurs that results in an increase in the number of moles of gas.
III. a solid changes to a liquid.
IV. a liquid changes to a gas.
V. condesation of steam of water
I
II
III
IV
V
The standard heat of combustion of ethanol, C2H5OH, is 1372 kJ/mol ethanol. How much heat (in kJ) would be liberated by completely burning a 20.0 g sample?
(a)
Which statement is incorrect?
At constant pressure, delta H = delta G + P delta V
The thermodynamic symbol for entropy is S
Gibbs free energy is a state function.
For an endothermic process, delta H is negative.
If the work done by the system is greater than the heat absorbed by the system, delta E is negative.
How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction below? delta Ho for the reaction is +624.7 kJ.
SiO2(s) + 3C(s) --> SiC(s) + 2CO(g)
366 kJ
1.13 x 105 kJ
5.06 kJ
1.33 x 104 kJ
31.2 kJ
Energi tidak dapat di ciptakan dan tidak dapat di musnahkan, namun bentuknya dapat di ubah. Pernyatan tersebut merupakan bunyi hukum…
A. 1 termodinamika
B. 2 termodinamika
C. 3 termodinamika
D. Kekelan momentum
E. Energi termodinamika
