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Test 2 Prep

# Test 2 Prep - Prep for Chem 31 Test#2 9 Copper metal has a...

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Prep for Chem 31 Test #2 9. Copper metal has a specific heat of 0.385 J/g °C. Calculate the amount of heat required to raise the temperature of 22.8 g of Cu from 20.0°C to 875°C. 329 J 1.0 10 -2 J 10.5 kJ 1.97 10 -5 J 7.51 kJ 10. Calculate the amount of heat necessary to raise the temperature of 12.0 g of water from 15.4°C to 93.0°C. The specific heat of water = 4.18 J/g °C. 324 J 0.0270 J 931 J 389 J 3,890 J 11. Ethanol undergoes combustion in oxygen to produce carbon dioxide gas and liquid water. The standard heat of combustion of ethanol, C 2 H 5 OH( l ), is -1366.8 kJ/mol. Given that f [CO 2 ( g )] = -393.5 kJ/mol and f [H 2 O( l )] = -285.8 kJ/mol, what is the standard enthalpy of formation of ethanol? 1,367 kJ/mol 687.6 kJ/mol -277.6 kJ/mol 3,010 kJ/mol -687.6 kJ/mol 12. Given the thermochemical equation 2 SO 2 + O 2 2 SO 3 , rxn = -198 kJ, what is the standard enthalpy change for the decomposition of one mole of SO 3 ? -198 kJ 198 kJ -99 kJ 396 kJ 99 kJ 13. Methanol (CH 3 OH) burns according to the equation 2 CH 3 OH( l ) + 3 O 2 ( g ) 2 CO 2 ( g ) + 4 H 2 O( l ), rxn = -1454 kJ. How much heat, in kilojoules, is given off when 75.0 g of methanol is burned?

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