The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 degrees celsius and a total pressure of 762 torr. What is the partial pressure of the oxygen gas?
What formula do I need to use?
Total pressure= sum of the partial pressures
762 torr-water vapor pressure=O2 pressure
water vapor pressure at 25ºC =23.756 torr
But check the reference value.
To find the partial pressure of the oxygen gas, you can use Dalton's Law of Partial Pressures. According to Dalton's law, the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each individual gas.
The formula for Dalton's Law is: P_total = P1 + P2 + P3 + ...
In this case, we are given the total pressure (P_total) as 762 torr. We need to find the partial pressure of oxygen gas. Therefore, the formula can be rearranged as:
P_oxygen = P_total - (P1 + P2 + P3 + ...)
Since the question states that the oxygen gas is collected over water, we need to take into consideration the vapor pressure of water at a given temperature. The vapor pressure at 25 degrees Celsius is 23.8 torr.
So, the formula to find the partial pressure of oxygen gas in this case is:
P_oxygen = P_total - P_water_vapor
Substituting the given values, we have:
P_oxygen = 762 torr - 23.8 torr
Therefore, the partial pressure of the oxygen gas is 738.2 torr.
To calculate the partial pressure of oxygen gas, you can use the equation known as Dalton's Law of Partial Pressures. According to Dalton's Law, the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the individual gases.
The formula for Dalton's Law is:
Total Pressure = Partial Pressure of Gas A + Partial Pressure of Gas B + ...
In this case, you want to find the partial pressure of oxygen gas, so Dalton's Law can be written as:
Total Pressure = Partial Pressure of Oxygen Gas + Partial Pressure of Other Gases
To calculate the partial pressure of oxygen gas, we need to know the total pressure and the partial pressures of any other gases present in the mixture.