**Cengel & Boles -- Chapter 2
questions**

**2-16C Can the enthalpy of a pure
substance at a given state be determined from a knowledge of ***u***,
***P***, and ***v***
data? How? **

Do an example using CP to justify your answer. (source-sink)Can this be done without using table lookup?

**2-19C Is it true that it takes more
energy to vaporize 1kg of saturated liquid water at 100 C than it
would to vaporize 1kg of saturated liquid water at 120 C?**

Create an example using CP to justify your answer.(source-sink)

**2.25 complete the following table for H**_{2}**O.**

T, C |
P, kPa |
v, m^{3}/kg |
Phase description |

50 | 4.16 | Saturated mixture | |

200 | Saturated vapor | ||

250 | 400 | ||

110 | 600 |

**2-33 The average atmospheric pressure
in Denver (elevation = 1610m) is 83.4 kPa. Determine the
temperature at which water in an uncovered pan will boil in
Denver. **

Do an example using CP to justify your answer. (source-sink)

**2-43 A piston-cylinder device initially
contains 50L of liquid water at 25 C and 300 kPa. Heat is
transferred to the water at constant pressure until the entire
liquid is vaporized.**

*Build a system in CP to answer the following
questions:*

(a) what is the mass of the water?

(b) what is the final temperature?

(c) determine the total enthalpy change

(d) show the process on a T-v diagram with respect to saturation lines.

**2-56 A rigid tank contains 10kg of air
at 150kPa and 20 C. More air is added to the tank until the
pressure and temperature rise to 250 kPa and 30 C, respectively. ***Using
CP, determine the amount of air added to the tank.*

**2-57 An 800-L rigid tank contains 10 kg
of air at 25 C. Determine the reading on the pressure gage if the
atmospheric pressure is 97 kPa.**