If $P_1$ is the partial pressure of a gas and $x_1$ is its mole fraction in a mixture,then the correct relation between $P_1$ and $x_1$ is:
- A$P_{total} = P_1 x_1$
- B$x_1 = \frac{P_1}{P_{total}}$
- C$P_{total} = 1 - P_1 x_1$
- D$P_{total} = P_1(1 - x_1)$
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