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2 - 1 4 A spherical balloon with a diameter of 9 m is filled with helium at 2 0 C and 2 0 0

2 - 14

A spherical balloon with a diameter of

9 m

is filled

with helium at

20 C

and

200

kPa. Determine the mole number and the mass of the helium in the balloon.

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