Write the formula to calculate the pressure of a dry gas collected over water.
- A$P_{\text{dry gas}} = P_{\text{total}} - P_{\text{water vapor}}$
- B$P_{\text{dry gas}} = P_{\text{total}} + P_{\text{water vapor}}$
- C$P_{\text{dry gas}} = P_{\text{total}} \times P_{\text{water vapor}}$
- D$P_{\text{dry gas}} = P_{\text{total}} / P_{\text{water vapor}}$
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