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A closed vessel \( A \) having volume \( V \) contains \( \mathrm{N}_{2} \) at
\( \mathrm{P} \) pressure \( P \) and temperature \( T \). Another closed vessel

W \( B \) having the same volume \( V \) contains \( \mathrm{He} \) at the same pressure \( P \). But temperature \( 2 T \). The ratio of masses of \( \mathrm{N}_{2} \) and He in the vessels \( A \) and \( B \) is
(1) \( 1: 2 \)
(2) \( 3: 2 \)
(3) \( 5: 2 \)
(4) \( 14: 1 \)
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