Chapter 17: Temperature, Thermal Expansion and the Ideal Gas Law

Question 1

What is the conversion of degrees Celsius to degrees Fahrenheit?

Answer 1

5℃ = 9℉

Question 2

Ideal Gas Law and breakdown of the variables

Answer 2

PV = nRT
P = pressure
V = volume
n = # of moles (mass(grams)/molecular mass (g/mol))
R = universal gas constant, 8.314 J/(mol*K)
T = temperature

Question 3

What is STP?

Answer 3

Standard temperature and pressure
T = 273.15 K
P = 1.0 atm = 1.013x10^5 N/m^2 = 101.3 Pa.
- choose N/m^2 for doing calculations, then convert P to whatever units later

Question 4

Volume of 1 mole of any ideal gas at STP?

Answer 4

22.4 L at STP = 0.0224 m^3

1 L = 1 x10^-3 m^3

Question 5

Internal Stress

Answer 5

F/A

F/A = ⍺ * E * ΔT

F = Force
A = Are
⍺ = coefficient of linear expansion
E = Young's Modulus for the material 
ΔT = T(final) - T(initial)

Question 6

For ideal gas law formula, if you are given pressure and volume in atm and liters how can you approach the problem?

Answer 6

If pressure and volume are given in atmospheres and liters, use the R value equal to 0.0821 Latm / molK