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7. (a) In solving
pV = nRT
for
n
, we first convert the temperature to the Kelvin scale:
(40.0 273.15)K
313.15 K
T
=+
=
. And we convert the volume to SI units: 1000 cm
3
=
1000
×
10
–6
m
3
. Now, according to the ideal gas law,
()
(
)
(
)
56
3
2
1.01 10 Pa 1000
10 m
3.88
10 mol.
8.31J/mol K 313.15K
pV
n
RT
−
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 Spring '08
 Any
 Physics

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