Dalton's Law of Partial Pressures (P_total = sum of partial pressures; Pi = mole fraction × P_total)

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P_total = sum of partial pressures; Pi = mole fraction × P_total

What each symbol means

SymbolWhat it stands for
P_iPartial pressure of gas i
x_iMole fraction
P_totalTotal pressure

When to use this

Ideal gas mixture; uniform T; gases fill same V (or use mole-fraction form).