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Thermochemistry Calculations Practice
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What does the letter q represent in this equation? q=m x c x ^t
heat absorbed or released
What does the first law of thermodynamics say?
energy cannot be created or destroyed only changed
What is one difference between an endothermic and an exothermic reaction?
exo- heat released to surroundings, temp of system goes down endo- heat absorbed by system, temp of system goes up
How much heat is released by the combustion of 206 g of hydrogen (H2)? ^Hcomb = -286 KJ/mol
29166 KJ
How much heat is released when 1255 g of water condenses to a liquid at 100C? ^Hcond= -40.7 Kj/mol
2834.5 KJ
How much heat is required to vaporize 343 g of liquid ethanol C2H5OH? (Hvap=38.6 KJ)
287 KJ
Claculat the energy needed to heat 60 g of aluminum from 100 C to 250 C. The specific heat of Al is 0.89 J/(g.c)
8.01 KJ or 8010 J
Calculate the energy released when 4570 g of iron cools from 1000 C to 20 C. The specific heat of iron is 0.45 J/(g.c)
-2015.37 KJ or -2015370J
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