Assuming that no water vapor is added as the parcel descends down the lee side of the mountain to sea level is the water vapor content the mixing ratio of the parcel higher or lower than before?

As the parcel descends down the lee side of the mountain to sea level without any additional water vapor, the mixing ratio of the parcel would be lower than before. This is because the parcel is compressing and warming as it descends, which decreases its relative humidity and therefore its mixing ratio. The decrease in mixing ratio is a result of the parcel's increased capacity to hold water vapor at higher temperatures.