Question

Calculate
capacity
Total no. of molecules in a room of
25 dm3 at Temperature 27°C and 1 atm.​

Answer 1

Answer:

: Temperature=25º C

Pressure =1 atm.

REQUIRED: Density of air

SOLUTION:

Composition of Air: 78% Nitrogen, 21% Oxygen, 1% Argon

Density at 25º C & 1 atm. is calculated as

= (Pressure * Molecular Weight) / (R * Temp.)

[ where R=.08206 atm.liter/mol/ºK]

= (1 * 28 ) / (.08206 * 298 )

= 1.145 g/l

Density of Oxygen = (1 * 32) / (.08206 * 298) = 1.309 g/l

Density of Argon = (1* 40) / (.08206 * 298) = 1.638 g/l

Density of Air = (.78 * 1.145) + (.21 * 1.309) + (.01 * 1.638) = 1.184 g/l