Question

Calculate the total pressure in a 10 L cylinder which contains 0.4 g of helium, cylinder. Assume ideal behaviour of gases.`(R=0.082 L atm K6(-1)mol^(-1))`

Answer 1

Total no. of moles of all gases(n)`=(0.4)/(4)+(1.6)/(32)+(1.4)/(28)=0.2`
Volume of the gasesour mixture (V)=10 L
Temperature (T)=27+273=300 K, R=0.082 L atm `K^(-1)mol^(-1)`
As gases have behaviour, PV=nRT or `P=(nRT)/(V)=(0.2xx0.082xx300)/(10)=0.492 atm`
`"Partial pressure of helium "=(0.4//4)/(0.2)xx0.492=0.246 atm`