Please help me with these chemistry questions.

Question

A sample of neon occupies a volume of 250 mL at STP. What will be the volume of the neon if the pressure is increased to 105.0 kPa?

a. 241 mL

b. 0.004 mL

c. 259 mL

d. 42.5 mL

We've learned that there is a lot of space between gas particles, and they have the freedom to move about and fill up a container. Which type of gas will spread out the fastest at the same temperature and pressure?

a. He

b. O₂

c. F₂

d. Ar

A system in which the rate of vaporization is equal to the rate of condensation is said to be in _____ _____. Please help me fill in the blanks.

Answer 1

Hello, Taylor,

A). There is no temperature change, so the relationship of pressure and volume of a gas is:

P1V1 = P2V2, where 1 and 2 are the initial and final conditions, respectively.

STP conditions for pressure are 1 atm pressure, which is also 760 mmHg, or 100 kPa. So P2 = 105.0 kPa in this problem.

Just substitute the values in the equation, solving for V2.

V2 = V1(P1/P2)

V2 = (250ml)*(100.0kPa/105.0 kPa)

I get an answer of 238.1 kPa, which doesn't quite match the option of 241.0 ml. That may be due to a different value of standard pressure provided in your book/cass. I know there was a small change in the official value a few years ago, so check the value given to you and calculate with that.

B.) He is the smallest atom is the list (that's an awkward sentence). It's small size will lead to a higher velocities since the kinetic energy is the same for all the choices, so the smaller atoms will have higher velocity, and there will also be fewer collisions to slow them down.

C.) I'm not sure what this question wants as an answer, but I would chose "chemical equilibrium," or some other expression that contains the word "equilibrium."

I hope this helps,

Bob