1) A sample of 1 mol of hydrogen has a temperature of 27 ° C (a) What is the kin
ID: 1637507 • Letter: 1
Question
1) A sample of 1 mol of hydrogen has a temperature of 27 ° C
(a) What is the kinetic energy of all the molecules in the sample?
(b) How fast should a person of 65 kg run to have the same kinetic energy?
2) Determine the specific heat of a metal substance if 135 kJ of heat is needed to raise the 5.1 kg temperature of a metal from 18.0 ° C to 40.0 ° C.
3) A gas is maintained in a chamber through a thermodynamic cycle as shown in the figure. Determine the energy transferred by the system as heat during the AC process if the energy added as QAB heat during the AB process is 20 J, there is no energy transferred as heat in the BC process and the work done during the cycle is 15 J.
como Calul ana dida como canon RAB el proceso BC v el trabajo hecho durante e VolumeExplanation / Answer
1. Hydrogen is monoatomic gas.
U = f/2 n R T
f = 3
U = (3/2) (1)( 8.314)(273 + 27) = 3741.3 J ....Ans
(b) KE = m v^2 /2
3741.3 = 65 v^2 /2
v = 10.7 m/s
2. Q = m C deltaT
135 x 10^3 J = 5.1 kg x C x (40 - 18)
C = 1203 J/kg deg C or 1.2 kJ / kg degC
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