Iron, specific heat capacity

Calculate the mass loss or gain for each of the following processes (a) a 50.0-g block of iron (specific heat capacity, 0.45 J-(°C)"1-g 1) cools from 600°C to... 

The heat capacity of a substance can be measured by a simple experiment. Add 50 g of water at 20.0°C to a calorimeter like that in Fig. 6.13. Then place 21 g of iron at 90.2°C into the calorimeter. Let s say that we measure a final temperature of 23.2°C. What is the specific heat capacity of iron ... 

STRATEGY All the heat lost by the iron is transferred to the water and the rest of the calorimeter. The heat lost or gained by each substance is equal to its heat capacity multiplied by the temperature rise or fall the heat capacity is the specific heat capacity multiplied by the mass. The heat capacity of the polystyrene cup is so small that we assume it can be neglected. Therefore, we can use Eq. 15 to write... 

The total emissivity of the oxidised iron surface is 0.78 and both emissivity and absorptivity may be assumed independent of the surface temperature. (Density of iron = 7.2 Mg/m3. Specific heat capacity of iron = 0.50 kJ/kg K.)... 

A 5.00-g sample of aluminum pellets (specific heat capacity = 0.89 J °C 1 g 1) and a 10.00-g sample of iron pellets (specific heat capacity = 0.45 J °C 1 g 1) are heated to 100.0°C. The mixture of hot iron and aluminum is then dropped into 97.3 g of water at 22.0°C. Calculate the final temperature of the metal and water mixture, assuming no heat loss to the surroundings. 

High-quality audio amplifiers generate large amounts of heat. To dissipate the heat and prevent damage to the electronic devices, manufacturers use heat-radiating metal fins. Would it be better to make these fins out of iron or aluminum Why (See Table 9.3 for specific heat capacities.)... 

Iron pellets with total mass 17.0 g at a temperature of 92.0°C are mixed in an insulated container with 17.0 g water at a temperature of 20.0°C. The specific heat capacity of water is 10 times greater than that of iron. What is the final temperature inside the container ... 

We need the specific heat capacity of iron and the conversion factor between joules and calories. 

The specific heat capacity of Cu-l.6Fe-9.9Ni (mass%) and Cu-0.8Fe-30.9Ni (mass%) alloys was measured by [1986Ric] in the temperature interval from 59 to 946°C. Both alloys show nearly the same specific heat capacity as copper. In Cu-l.6Fe-9.9Ni (mass%) alloy an additional contribution, due to the precipitation of nickel-iron particles is found. It should be noted that investigated alloys contained up to 0.03 mass% C and 0.81 mass% Mn. 

Crawford concluded that the specific heat ( capacity for containing heat ) of dephlogisticated air (oxygen) is 4 6 times that of common air. He also concluded that the capacities of bodies for containing heat are diminished by the addition of phlogiston, and increased by the separation of this principle . The ratios of the specific heats of the calces (oxides) of metals to those of the metals were found to be (calx metal) tin, 14-7 10 4, iron 8 3 1, lead 19 9 14 7, antimony ii-6 4-5. 

What is the heat gained/released at constant pressure equal to (q = ) What is the heat gained/released at constant volume equal to (qv = ) Explain why AH is obtained directly from a coffee-cup calorimeter, whereas AE is obtained directly from a bomb calorimeter. High-quality audio amplifiers generate large amounts of heat. To dissipate the heat and prevent damage to the elecfronic components, heat-radiating metal fins are used. Would it be better to make these fins out of iron or aluminum Why (See Table 6.1 for specific heat capacities.)... 

Fix-bed reactor is a typical reactor in FTS process, which is firsdy applied in industrial FTS process. As early as 1979, Atwood and Bennett (Albal et al., 1984) have built a 0.25 bilHon c.f/d syngas management FT tubular reactor one-dimensional pseudo homogeneous piston flow model, based on dynamic model of molten iron catalysts as shown in Eqs. (9) and (10), in which dx is the occupancy of CO, dt is the diameter of the tank, r is the reaction rate, F is the inlet amount of the gas, Cp is the specific heat capacity of the system, hu, is the heat transfer coefficient, and 2 is the axial coordination of the tank. 

Nernst, Koref, and Lindematm (1910) described an aneroid drop calorimeter for the measurement of specific heat capacities. Figure 7.14 shows the design of this instrument. The entire system is located in isothermal surroundings such as melting ice. Of particular interest is the measurement of the temperature change of the calorimeter substance by means of 10 iron-constantan thermocouples mounted between the calorimeter substance and the isothermal Ud. 

A 10.0 g piece of pure iron has its temperature changed from 25 °C to 500 °C. The specific heat capacity of iron is 0.45 J g" °C k Calculate the amount of heat energy in joules required to bring about this change. 

Heat capacities occur in many places in the following sections and chapters, and we need to be aware of their properties and how their values are reported. First, we note that the heat capacity is an extensive property 2 kg of iron has twice the heat capacity of 1 kg of iron, so twice as much heat is required to change its temperature to the same extent. It is more convenient to report the heat capacity of a substance as an intensive property. We therefore use either the specific heat capacity, Q, the heat capacity divided by the mass of the sample (Cs = C/m, in joules per kelvin per gram, J K g ), or the molar heat capacity, C the heat capacity divided by the amount of substance (C = CIn, in joules per kelvin per mole, J K moT ). In common usage, the specific heat capacity is often called simply the specific heat. 

The solid flow only covers zone D and some mesh elements there are blocked to the solid flow to fit the thickness of iron ore fines layer which are illustrated in Figure 1. Conservation equations of the steady, incompressible solid flow could be defined using the general equation is Eq. (6). In Eq. (6), physical solid velocity is applied. Species of the solid phase include metal iron (Fe), iron oxide (Fc203) and gangue. Terms to represent, T and 5 for the solid flow are listed in Table n. Specific heat capacity, thermal conductivity and viscosity of the solid phase are constant. They are 680 J/(kg K), 0.8 W m/K and 1.0 Pa s respectively. Boundary conditions for solid flow are Sides of the flowing down channels and the perforated plates are considered as non-slip wall conditions for the solid flow and are adiabatic to the solid phase up-surfeces of the solid layers on the perforated plates are considered to be free surfaces at the solid inlet, temperature, volume flow rate and composition of the ore fines are set depending on the simulation case At the solid outlet, a fiilly developed solid flow is assumed. 

A 465 g chunk of iron is removed from an oven and plunged into 375 g water in an insulated container. The temperature of the water increases from 26 to 87 °C. If the specific heat capacity of iron is 0.449 J g °C, what must have been the original temperature of the iron ... 

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