The gas that a diver breathes must be maintained at a partial pressure of 0.20 atm of oxygen. More oxygen could poison the diver, and less would lead to suffocation. The total pressure, however, must be equal to the external pressure to avoid collapsing the lungs. A special valve is used to equalize the pressure inside the diver's lungs with the external pressure by adding helium gas. The valve also maintains oxygen levels by using Dalton's Law. If the total pressure in the cylinder is 1.00 atm, what is the pressure of the helium?

The partial pressure of helium gas is 0.80 atm

Explanation:

Dalton's law of partial pressure states that the total pressure of the system is equal to the sum of partial pressure of each component present in it.

To calculate the partial pressure of helium gas, we use the law given by Dalton, which is:

We are given:

Total pressure of the cylinder, = 1.00 atm

Vapor pressure of oxygen gas, = 0.20 atm

Putting values in above equation, we get:

Hence, the partial pressure of helium gas is 0.80 atm

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

the answer is 1 i believe