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  1. The volume and temperature of air (assumed to be an ideal gas) in a closed vessel is 2.87 m3 and 300 K, respectively. The gauge pressure indicated by a manometer fitted to the wall of the vessel is 0.5 bar. If the gas constant of air is R = 287 J/kgK and the atmospheric pressure is 1 bar, the mass of air (in kg) in the vessel is
    1. 1.67
    2. 3.33
    3. 5.00
    4. 6.66
Correct Option: C

P = 1 + 0.5 = 1.5 bar

Pv = MRT; M=
PV
RT

M=
1.5 × 105 × 2.87
= 5 kg
287 × 300



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