9
III.
In this piston cylinder device, D1=20cm diameter, D2 = 10 cm diameter, and the initial
volume of chamber 2 is 0.1m$^3$. Chamber 1 contains 1kg of air, chamber 2 contains 1kg of
water, and chamber 3 is evacuated. Initially, the temperature of all chambers is 100°C and
both the liquid and vapor are present in present in chamber 2. The whole system is now
heated until the temperature of chamber 2 is 120°C. Answer the following questions
1 Find the initial pressure in chamber 1
a. 101.45 kPa
b. 486. 3 kPa
$25.3$ kPa
d. 220.0 kPa
2 Determine the initial volume of chamber 1
a. 0.1 m$^3$
b. 30.1 m$^3$
c. 8.46 m$^3$
$4.23$ m$^3$
3 Determine the change in volume in chamber 1 throughout this process
a. 2.456 m$^3$
$1.955$ m$^3$
c. 7.765 m$^3$
d. -6.567 m$^3$
4 Determine the total heat transfer of this system
$215.8420$ kJ/kg
b. -310.4367 kJ/kg
c. -6732.456 kJ/kg
d. 784.0632 kJ/kg
5 Based on the past calculations, will there be an increase or decrease of entropy in the
system
Increase
b. Decrease
