Gas Law study questions?

Question

Do I have these correct:
A steel cylinder with a vol of 15.0 L is filled with 50g of nitrogen gas at 25 degrees celcius. What is the pressure of the N2 in the cylinder?

I got 5.82 atm's of pressure


2)
A container filled with 4.0 x 10^22 molecules of O2 at 5 degrees celcius and 845 mm HG. What is the volume in ML in the container

I got 1.36L which is .001mL

Answer 1

For the first one, I think you used 14 for the atomic weight of nitrogen to get the number of moles. Since nitrogen gas is N2, you should use 28 g/mol. That'll give you the right answer.

For the second, your answer in L is correct. To convert L into mL, you need to MULTIPLY by 1000 since there are 1000 mL/1 L.

Answer 2

for number 1 i got 2.91 atm's of pressure using the formula
PV=nRT which is (P)(15.0L)=(1.7844mol)(.08206)(298.15K)
the formula mass of N2 is 28.02 so u divide 50g by FM to get moles

for number two i get the 1.36 L,same answer but do u mean megaLiters when you say ML or milliliters mL

Answer 3

I got 2.91atm for question 1. And for question 2 i got 0.136L which is 136mL.