A calorimeter contains 710 mL of water at 21.1oC. A 345 g piece of iron is heated in a Bunsen burner flame, then quickly submerged in the water in the calorimeter. After adding the hot iron, the temperature of the water in the calorimeter rises to a maximum of 42.5oC. Determine the temperature (in oC) to which the piece of iron was heated. Use the following values for your calculations. specific heat of water: 4.184 J/goC density of water: 1.0 g/mL specific heat of iron: 0.449 J/goC Iron can be extracted from the iron(III) oxide found in iron ores (such as haematite) via an oxidation-reduction reaction with carbon. The thermochemical equation for this process is: 2Fe2O3(s)+3C(s)→4Fe(l)+3CO2(6)ΔH^o=+467.9kJ How much heat (in kJ) is needed to convert 623 g Fe2O3 into pure iron in the presence of excess carbon? kJ When 7.50 ×107 kJ of heat is added to Fe2O3 in the presence of excess carbon, how many kilograms of Fe can be produced ? kg When octane (C8H18, density = 0.699 g/mL) undergoes complete combustion, it provides energy according to the reaction: 2C8H18(l)+25O2(g)→16CO2(g)+18H2O(l)ΔH^o=−10,392kJ How much heat, in kJ, is produced by the amount of octane needed to drive 434 kilometers in a car that averages 21.9 km/L? kJ
A calorimeter contains 710 mL of water at 21.1oC. A 345 g piece of iron is heated in a Bunsen burner flame, then quickly submerged in the water in the calorimeter. After adding the hot iron, the temperature of the water in the calorimeter rises to a maximum of 42.5oC. Determine the temperature (in oC) to which the piece of iron was heated.
Use the following values for your calculations.
specific heat of water: 4.184 J/goC
density of water: 1.0 g/mL
specific heat of iron: 0.449 J/goC
Iron can be extracted from the iron(III) oxide found in iron ores (such as haematite) via an
2Fe2O3(s)+3C(s)→4Fe(l)+3CO2(6)ΔH^o=+467.9kJ
How much heat (in kJ) is needed to convert 623 g Fe2O3 into pure iron in the presence of excess carbon? kJ
When 7.50 ×107 kJ of heat is added to Fe2O3 in the presence of excess carbon, how many kilograms of Fe can be produced ? kg
When octane (C8H18, density = 0.699 g/mL) undergoes complete combustion, it provides energy according to the reaction:
2C8H18(l)+25O2(g)→16CO2(g)+18H2O(l)ΔH^o=−10,392kJ
How much heat, in kJ, is produced by the amount of octane needed to drive 434 kilometers in a car that averages 21.9 km/L?
kJ
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