NCERT Class XI Chemistry States of Matter Solutions

Question : 8

Total: 23

What will be the pressure of the gaseous mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1 L vessel at 27°C?

Solution:

Partial pressure of hydrogen gas
V1 = 0.5 L V2 = 1.0 L P1 = 0.8 bar P2 = ?
Applying Boyle’s law (constant T and n)
P1V1 = P2V2 or P2 =

P1V1

∴ P2 =

(0.8‌bar)×(0.5L)

(1.0L)

= 0.40 bar
Partial pressure of oxygen gas,
V1 = 2.0 L, V2 = 1.0 L, P1 = 0.7 bar , P2 = ?
or P2 =

P1V1

(0.7‌bar)×(2.0L)

(1.0L)

= 1.40 bar
Pressure of the gas mixture, Pmix = PH2+PO2 = 0.40 + 1.40 = 1.80 bar

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