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If a room has dimensions 3m×4m×5m  what is the mass of air in the room if density of air at NTP is 1.3×kg/m3        

a
78 kg
b
87 kg
c
8 kg
d
8.7 kg

detailed solution

Correct option is A

m=ρ×V=1.3×3×4×5=78 kg

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