P20 049

49. Argon is a monatomic gas, so f = 3 in Eq. 20-51, which provides

R =

8.31

mol

·K

1 cal

4.186 J

= 2.98

cal

mol

·C

◦

where we have converted Joules to calories (Eq. 19-12), and taken advantage of the fact that a Celsius
degree is equivalent to a unit change on the Kelvin scale. Since (for a given substance) M is eﬀectively a
conversion factor between grams and moles, we see that c

(see units speciﬁed in the problem statement)

is related to C

= c

where M = mN

where m is the mass of a single atom (see Eq. 20-4).

(a) From the above discussion, we obtain

m =

2.98/0.075

6.02

× 10

= 6.6

× 10

−23

g .

(b) The molar mass is found to be M = C

= 2.98/0.075 = 39.7 g/mol which should be rounded

to 40 since the given value of c

is speciﬁed to only two signiﬁcant ﬁgures.

Document Outline

Main Menu
Chapter 1 Measurement
Chapter 2 Motion Along a Straight Line
Chapter 3 Vectors
Chapter 4 Motion in Two and Three Dimensions
Chapter 5 Force and Motion I
Chapter 6 Force and Motion II
Chapter 7 Kinetic Energy and Work
Chapter 8 Potential Energy and Conservation of Energy
Chapter 9 Systems of Particles
Chapter 10 Collisions
Chapter 11 Rotation
Chapter 12 Rolling, Torque, and Angular Momentum
Chapter 13 Equilibrium and Elasticity
Chapter 14 Gravitation
Chapter 15 Fluids
Chapter 16 Oscillations
Chapter 17 Waves—I
Chapter 18 Waves—II
Chapter 19 Temperature, Heat, and the First Law of Thermodynamics
Chapter 20 The Kinetic Theory of Gases
- 20.1 - 20.10
  - 20.1
  - 20.2
  - 20.3
  - 20.4
  - 20.5
  - 20.6
  - 20.7
  - 20.8
  - 20.9
  - 20.10
- 20.11 - 20.20
  - 20.11
  - 20.12
  - 20.13
  - 20.14
  - 20.15
  - 20.16
  - 20.17
  - 20.18
  - 20.19
  - 20.20
- 20.21 - 20.30
  - 20.21
  - 20.22
  - 20.23
  - 20.24
  - 20.25
  - 20.26
  - 20.27
  - 20.28
  - 20.29
  - 20.30
- 20.31 - 20.40
  - 20.31
  - 20.32
  - 20.33
  - 20.34
  - 20.35
  - 20.36
  - 20.37
  - 20.38
  - 20.39
  - 20.40
- 20.41 - 20.50
  - 20.41
  - 20.42
  - 20.43
  - 20.44
  - 20.45
  - 20.46
  - 20.47
  - 20.48
  - 20.49
  - 20.50
- 20.51 - 20.60
  - 20.51
  - 20.52
  - 20.53
  - 20.54
  - 20.55
  - 20.56
  - 20.57
  - 20.58
  - 20.59
  - 20.60
- 20.61 - 20.70
  - 20.61
  - 20.62
  - 20.63
  - 20.64
  - 20.65
  - 20.66
  - 20.67
  - 20.68
  - 20.69
  - 20.70
- 20.71 - 20.80
  - 20.71
  - 20.72
  - 20.73
  - 20.74
  - 20.75
  - 20.76
  - 20.77
  - 20.78
  - 20.79
  - 20.80
- 20.81 - 20.90
  - 20.81
  - 20.82
  - 20.83
  - 20.84
  - 20.85
  - 20.86
  - 20.87
  - 20.88
  - 20.89
  - 20.90
- 20.91 - 20.92
  - 20.91
  - 20.92
Chapter 21 Entropy and the Second Law of Thermodynamics
Chapter 22 Electric Charge
Chapter 23 Electric Fields
Chapter 24 Gauss’ Law
Chapter 25 Electric Potential
Chapter 26 Capacitance
Chapter 27 Current and Resistance
Chapter 28 Circuits
Chapter 29 Magnetic Fields
Chapter 30 Magnetic Fields Due to Currents
Chapter 31 Induction and Inductance
Chapter 32 Magnetism of Matter: Maxwell’s Equation
Chapter 33 Electromagnetic Oscillations and Alternating Current
Chapter 34 Electromagnetic Waves
Chapter 35 Images
Chapter 36 Interference
Chapter 37 Diffraction
Chapter 38 Special Theory of Relativity
Chapter 39 Photons and Matter Waves
Chapter 40 More About Matter Waves
Chapter 41 All About Atoms
Chapter 42 Conduction of Electricity in Solids
Chapter 43 Nuclear Physics
Chapter 44 Energy from the Nucleus
Chapter 45 Quarks, Leptons, and the Big Bang

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