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Question -

What will be the pressure of the gaseous mixturewhen 0.5 L of H2 at0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1 L vessel at 27°C?



Answer -

Step I. Calculation ofpartial pressure of H2 in 1 L vessel.
V1, = 0-5 L V2 = 1.0 L
P1 = 0.8 bar P2 = ?
According to Boyle’s Law, P1V1 = P2V2
P2 = V2 = (0.8bar)×(0.5L)(1.0L) =0.4bar
Step II. Calculationof partial pressure of O2 in1 L vessel.
V1 = 2.0 L V2 = 1.0L
P1 = 0.7 bar P2 = ?
According to Boyle’s Law, P1V1 = P2V2
P2 = V2 = (0.7bar)×(2.0L)(1.0L) =1.4bar
Step III. Calculation of total pressure of gaseous mixture.
P = P1 +P2 = (0.4 + 1.4 ) bar =1.8 bar

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