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March 29, 2015

March 29, 2015

Posted by **Nicole** on Monday, October 3, 2011 at 10:18pm.

(a). What is the room’s volume in cubic meters?

(b). What is the mass of air in the room in kilograms? (Assume density of air is 1.2 g/ L and the room is empty of furniture.)

- Chemistry -
**DrBob222**, Monday, October 3, 2011 at 10:56pmft x 12"/ft x 2.54 cm/in x 1m/100cm = ?meters

Convert 18ft, 15 ft, an 8.5ft to meters, then volume = length x width x height. That will give you #1.

For #2, convert cubic meters to liters (I would go from cubic meters to cc, then to L), then volume x density = mass in grams.

- Chemistry -
**Nicole**, Monday, October 3, 2011 at 11:12pmok quick question i got the lxwxh and then that would be # 1 .. for i take the answers from one and convert them to liters.. ?/

- Chemistry -
**DrBob222**, Monday, October 3, 2011 at 11:15pmThere are 100 cm in 1 m; therefore,

?cubic meters x (1m/100 cm)^3 = x cc.

Then convert x cc to liters (you remember 1000 cc = 1L)

- Chemistry -
**Nicole**, Monday, October 3, 2011 at 11:16pmok so a was 84.9 vol .. so i take that and then.. i then take the m and convert them to kil.. then do the vxd=m

- Chemistry -
**Nicole**, Monday, October 3, 2011 at 11:28pmok for 2 i did m= 1.2g/l /84.9= .0141 then moved dec. 3 places which made it 14.1 kg is that right or close..

- Chemistry -
**DrBob222**, Monday, October 3, 2011 at 11:41pmNo, for two reasons.

#1. I think the volume is closer to 65 m^3 so you need to rethink that part.

#2. I screwed up on the conversion of m^3 to cc.

m^3 x (100cm/1m) x (100 cm/1m) x (100 cm/1m) = x cc. Divide that by 1000 to convert to L. I think the answer is close to 65,000 L.

65,000 L x 1.2 g/L = ?grams and grams/1000 = kg. My final answer is about 78 kg.

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