Q1: The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the

ANS:C - percentage saturation.

Percentage saturation refers to the amount of vapor present in a gas mixture relative to the maximum amount of vapor that could be present at a given temperature and pressure, expressed as a percentage. It indicates how close the gas mixture is to being saturated with vapor. In other words, percentage saturation tells us what proportion of the available space for vapor in the gas mixture is actually occupied by vapor. If the percentage saturation is 100%, it means the gas mixture is fully saturated with vapor at that temperature and pressure. If it's less than 100%, there is still room for more vapor to be added before saturation is reached. For example, if the percentage saturation is 50%, it means the gas mixture is only halfway saturated with vapor; there's still capacity for more vapor to be added until it reaches full saturation. So, percentage saturation provides a convenient way to quantify the vapor content of a gas mixture relative to its saturation point under specific conditions.