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If a room has dimensions $3 m \times 4 m \times 5 m$ what is the mass of air in the room if density of air at NTP is $1.3 \times k g / m^{3}$

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$78 k g$

$87 k g$

$8 k g$

$8.7 k g$

answer is A.

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Detailed Solution

$m = ρ \times V = 1.3 \times 3 \times 4 \times 5 = 78 k g$

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