Q. In a mixture of gases, the partial pressure of each gas is:
गैसों के मिश्रण में, प्रत्येक गैस का आंशिक दबाव होता है:
Explanation
For a gas mixture, the partial pressure of each component is given by:
Formula: P_i = χ_i × P_total
Where χ_i is the mole fraction of component i.
Mole fraction: χ_i = n_i/n_total
Dalton's Law derivation:
- Each gas behaves independently
- P_i = (n_i RT)/V
- P_total = (n_total RT)/V
- Therefore: P_i/P_total = n_i/n_total = χ_i
Example:
- Air: 78% N₂, 21% O₂, 1% other gases
- At 1 atm: P_N₂ = 0.78 atm, P_O₂ = 0.21 atm
Note: This is different from volume fraction or mass fraction!
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