Question typo for density question....?

Question

the density of air at 25C is 1.19 g/L. WHat is the mass, in Kg, of the air in a room that measures 12.5 X 15.5 X 8.0 ft?
how would I go about this???

Answer 1

First thing u do is change the measurement unit (ft) into cm. 1 ft equal 30.48 cm. change all three numbers, 12.5ft = 381cm, 15.5ft = 472.44cm, and 8.0ft = 243.84. Now multiply them to get an answer of 4.39 x 10^7 cm^3 (cubic centimeter). Now 1 cm^3 equals 1 ml which mean u have 4.39 x 10^7ml. Now change the 4.39 x 10^7ml into 4.39 x10^4 L. Now we have the density and we have the volume, we can solve for mass. Mass = Density X Volume. Mass = 1.19 g/L X 4.39 x10^4 L which equals 5.22 x 10^4 g. However we are still not done as the question requires u to put ur final answer into Kg. Since 1000g = 1 Kg, ur final answer is 52.2 Kg.

Answer 2

Density = 1.19 g/L

Volume = 12.5 ft * 15.5 ft * 8 ft = 1550 ft^3
Conversion: 1 cubic foot = 0.028 cubic meter

Volume:
1550 ft^3 = 43.4 m^3
Conversion: 1 cubic meter = 1000 Liter
Volume: 43.4 * 10^3 L

mass = density * volume
m = 1.19 g/L * 43.4 * 10^3 L

m = 51.646 * 10^3 g = 51.646 kg

Answer 3

D=M/V
DV=M

Convert the length measurements to inches:

12.5 ft * (12 in/12 ft)=150(line over the 0) in
15.5 ft * (12 in/12 ft)=186 in
8.0 ft * (12 in/12 ft)=96 in

Convert them then from in to cm:

150 in * (2.54 cm/1 in)=381 cm
186 in * (2.54 cm/1 in)=472.44 cm
96 in * (2.54 cm/1 in)=243.84 cm


Find the volume of the room in L and then multiply by the density:

381 cm * 472.44 cm * 243.84 cm * (1 mL/1 cm^3) * (1 L/1000 mL) * (1.19 g/L) * (1 kg / 1000 g) = 52 kg (with correct sig figs)

Answer 4

Get the volune of air in the room. = L x B x H = V
Convert the Volune from ft3 into L
Density(g/L) x Volune(L) = Mass(g)
Then Convert Mass(g) to Mass(kg).

Note: 1 ft3 = 28.31685 L

The calculation is as such.

12.5ft x 15.5ft x 8ft = 1550ft3

1550ft3 x 28.31685 = 43891.1175 L

43891.1175 L x 1.19 g/L = 52230.429825 g

1000g = 1kg

Therefore 52230.429825 g = 52230.429825/1000 = 52.23 kg Air

There you are.

Answer 5

density is mass per unit volume since more and more electrons are added either side across/ downwards thus density increases both sides. However atomic radius decreases Lto R and increases down the group. I hope u got it

Answer 6

WELL YOU SHOULD FIRST GET THE VOLUME OF THE ROOM
12.5 X 15.5 X 8 FT WHICH WOULD EQUAL FT^3 CONVERT THAT TO LITERS
\
GET THE LITERS IT EQUATES TO AND MULTIPLY THIS BY THE DENSITY AND YOU WILL CANCEL OUT LITERS AND BE LEFT WITH GRAMS OF AIR!!!!!

Answer 7

You have the density and the volume. That's all you need to get mass.

You'll need to do some units conversion but that shouldn't be a problem for your big brain.