Question

The total pressure inside a vessel containing a mixture of neon, argon, and helium gases is 750 kPa. The partial pressure of neon is 230 kPa, and the partial pressure of argon is 250 kPa. What is the partial pressure of helium?

Answer 1

p = 750 kPa

p Ne = 230 kPa
p Ar = 250 kPa
p He = ?

p = p Ne + p Ar + p He
p He = 750 kPa - 250 kPa - 250 kPa = 270 kPa

Answer: The partial preassure of helium equals 270 kPa.

:-) ;-)

Answer 2

Answer :  The partial pressure of $He$ is, 270 Kpa

Solution :

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

$P_T=p_{Ne}+p_{Ar}+p_{He}$

where,

$P_T$ = total partial pressure = 750 Kpa

$P_{He}$ = partial pressure of helium = ?

$P_{Ne}$ = partial pressure of neon = 230 Kpa

$P_{Ar}$ = partial pressure of argon = 250 Kpa

Now put all the given values is expression, we get the partial pressure of the helium gas.

$750Kpa=230Kpa+250Kpa+p_{He}$

$p_{He}=270Kpa$

Therefore, the partial pressure of $He$ is, 270 Kpa