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Nitrogen dioxide, NO2(g) (Hf = 33.84 kJ/mol), is decomposed according to the following reaction:What is the enthalpy change when 2.50 mol of nitrogen dioxide decomposes? Use .
A
13.5 kJ of energy releasedB
13.5 kJ of energy absorbedC
84.6 kJ of energy releasedD
84.6 kJ of energy absorbed22
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A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. This flame is used to melt a metal. Which energy transformation represents this process?
A
chemical energy into thermal energyB
kinetic energy into potential energyC
kinetic energy into electromagnetic energyD
potential energy into chemical energy23
How is the kinetic energy of the particles of a substance affected during a phase change?
A
Kinetic energy increases during exothermic changes and decreases during endothermic changes.B
Kinetic energy decreases during exothermic changes and increases during endothermic changes.C
Kinetic energy does not change, but the potential energy does.D
Kinetic energy changes in the opposite way that the potential energy changes.Did you find these answers helpful?
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