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49. Using Eq. 1934 and Eq. 1935, we arrive at
Δ
v
= (
3
−
2
)
RT/M
(a) We find, with
M
= 28 g/mol = 0.028 kg/mol (see Table 191),
Δ
v
i
=87 m/s at 250 K,
(b) and
Δ
v
f
=122
≈
1.2
¡
10
2
m/s at 500 K.
(c) The expression above for
Δ
v
implies
T
=
M
R
(
3
−
2
)
2
(
Δ
v
)
2
which we can plug into Eq. 204 to yield
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 Spring '08
 Any
 Physics

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