The "air" in the space suit of astronauts is actually pure oxygen supplied at a pressure of 0.30 bar. the two tanks on a space suit each have a volume of 3980. cm3 and have an initial pressure of 5860. kpa. assuming a tank temperature of 16 c, what mass of oxygen is contained in the two tanks?

There are 310.7 grams of O₂ in each tank

Explanation:

To solve this problem we use PV=nRT. First we convert units:

We put the data in the equation and solve for n:

Finally we convert mol O₂ into mass:

c, liquids evaporate, creating a gas

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.