Dimensional analysis: a room measures 775 cm x 1400 cm x 260 cm. the density of oxygen is .001429 g/cm^3. how many kilograms of oxygen are present in the room

The  number  in Kg  of oxygen that  are present  in the room is  

403.1209  kg

calculation

mass=density x volume

density = 0.001429 g/  cm³

volume  =775 cm x 1400 cm x 260  cm =2.821 x10^8 cm³

mass  =0.001429 g/cm³  x( 2.8 x 10^8 cm³) =403120.9 grams

convert  g to Kg

that is  1 kg  = 1000 g

             ? kg    =403120.9 g

by cross   multiplication

=[(403120.9  g  x 1 kg) /1000 g]  =403.1209 kg

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