Air is composed of approximately 78% N₂, 21% O₂, and 1% percent other gases, the density of He at stp will be 0.1637 g/L
At standard, temperature, and pressure (STP) the values are:
Pressure (P) = 1 atm
Temperature (T) = 25 °C or 298.15 K
Density of helium (He) = ?
To calculate the density of He, we will use the modified form of ideal gas law as:
PV = nRT
n = number of moles
n = m / M
Put the value of n in ideal gas law
PV = mRT / M
m / V = PM / RT
Where m = mass
M = molarity
V = volume
P = pressure
T = absolute temperature
R = universal constant of gasses (value = 0.082 atm.L / mol.K)
As we know that:
Density = m / V
Put density in place of m / V, the above equation will be:
Density = PM / RT
Put the values:
Density of Helium (He) = (1 atm) × (4.0026 g/mol) ÷ (0.082 atm.L/mol.K)(298.15 K)
Density of Helium (He) = 0.1637 g/L
A ballon filled with He rises because the density of He is lower than air.
You can also learn about density from the following question:
https://brainly.com/question/15164682
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