Molecular Physics | Thermodynamics Answers

904.5 g of ice is melted at a temperature of
29◦F.
Find the change in entropy.
Answer in units of J/K.

1. An unbreakable meteorological balloon is released from the ground.Ground level pressure is 98.5 KPa and the temperature is 18.0 Celsius. The balloon contains 74.0 liters of Hydrogen gas. As the balloon soars up, the pressure drops to 27.0 KPa. What is the new volume of the balloon, assuming no temperature change?
2. Re-read question 1, but considering in the real world when you go up in altitude the temperature does change. what is the actual volume of the meteorological balloon if the temp also drops 79.0 celsius from its original temperature?

state the steady flow energy equation and mention all the variables used and their corresponding standard si unite

the temperature at which the solid and liquid phases are in equilibrium is?

a) boiling point

b) melting point

c) freezing point

d) equilibrium point

An ideal gas is in equilibrium at initial state with temperature
T=137oCT=137oC
, pressure P = 0.75Pa and volume
V=0.75m3V=0.75m3
. If there is a change in state in which the gas undergoes an isothermal process to a final state of equilibrium during which the volume is doubled. Calculate the temperature and pressure of the gas at this final state.

187oC187oC
and
0.19m30.19m3

394oC394oC
and
0.38m30.38m3

187oC187oC
and
0.38m30.38m3

394oC394oC
and
0.19m30.19m3

Which of the following correctly represents the temperature of an ideal gas?

3Rn2Ek3Rn2Ek

2Ek3Rn2Ek3Rn

Ek3REk3R

2EkRn

A certain resistance thermometer at triple point of water has resistance of
152.0Ω152.0Ω
. What is the temperature of the system in degrees Celsius when the resistance of the thermometer is
230.51Ω230.51Ω
?

414.2oC414.2oC

141.0oC141.0oC

253.2oC253.2oC

80.4oC80.4oC

Which of the following is NOT true about conduction as a means of heat transfer?
transfer of heat occurs through sucessive collisions of the atoms or molecules
the average kinetic energy of the atoms or molecules is greater in the hot object than in the cold object
the transfer process requires a material medium for it to take place
there is net translational motion of the atoms or molecules from their mean equilibrium positions

Calculate the change in internal energy of 2kg of water at
90oC90oC
when it is changed to
3.30m33.30m3
of steam at
100oC100oC
. The whole process occurs at atmospheric pressure. The latent heat of vaporization of water is
2.26×106J/kg2.26×106J/kg
.
4.27 MJ
3.43 kJ
45.72 mJ
543.63 J

Calculate how much heat is needed to be supplied to a gas at a pressure of
1.25×105Pa1.25×105Pa
, such that the pressure increases by 25 per cent at constant volume, and the internal energy by 120J.
240J
120J
320J
480J