b) The heat capacity of solid lead oxide [PbO (s)] is given by Cp.m JK mol 44.35 – 1.47 x 10-3 Calculate the change in molar enthalpy (AHm) (in unit J mol) of Pbo (s) if it is cooled from 500 K to 300 K at constant pressure (P). Quantity Cp,m denotes molar heat capacity at constant pressure.
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- ANSWER THE FF and SHOW COMPLETE SOLN: a.) An aluminum sheet of thickness 8.3 cm and area 13 m^2 is welded on top of a brass sheet of the same thickness and area. The thermal conductivities of aluminum and brass are 205 W/m·K and 109 W/m·K, respectively. The aluminum end is kept at 20 °C while the brass end is kept at 30 °C. At the moment when the interface temperature is 24 °C, what is the heat current through the brass sheet? (answer for this is: 102 kW) b.) A 10.0-cm long steel rod is welded end to end to a 20.0-cm long copper rod of the same cross-sectionalarea. The thermal conductivities of steel and copper are 50.2 W/m·K and 385 W/m·K, respectively. The steel endis kept at 100 °C while the copper end is kept at 0 °C. What is the steady-state temperature at the interfaceconnecting the two rods? (answer for this is 20.7 °C)2 mol of an ideal monoatomic gas moves from State 1 to State 2 P at constant pressure 1000 Pa and size V1=2 m3,V2 =3 m3. Calculated value W, Q, U, TI, T2An ideal gas has a volume of 1.0 Liter, a pressure of 1.0 atm., and a temperature of 27 o C. If the pressure is increased to 2 atm., and the volume is compressed to 0.6 Liters, what is the final temperature of the gas?
- asapFor a steel alloy it has been determined that a carburizing heat treatment of 10.2h duration will raise the carbon concentration to 0.340 wt% at a point 2.10 mm from the surface. Estimate the time necessary to achieve the same concentration at a 5.40 mm position for an identical steel and at the same carburizing temperature. t = hThe reaction rate for the prepupal development of male Drosophila is temperature-dependent. Assuming that the reaction rate is exponential as in R x e-bdlCB!) , the activation energy for this development is 3.01 x 10-19 J. A Drosophila is originally at 20.10°C, and its temperature is increasing. If the rate of development has increased 3.50%, how much has its temperature increased? The value of the Boltzmann constant is 1.381 x 10-23 J/K (see Table B.1). °C
- tii) An ideal gas with an initial pressure of 2 x10' Pa and an initial volume of 2 m' expands Isothermally (at constant temperature) to a volume of 5 m' Estimate the final pressure of the gas.Pls asapCurrent Attempt in Progress Compute (a) the number of moles and (b) the number of molecules in 2.2 cm of an ideal gas at a pressure of 88 Pa and a temperature 3 of 220 K. (a) Number Units (b) Number i Units >