• Support PF! Buy your school textbooks, materials and every day products Here!

Atoms in a Helium Balloon.

  • Thread starter Fittleroni
  • Start date
  • #1
23
0

Homework Statement



(a) How many atoms of helium gas fill a balloon of diameter 29.4 cm at 23.5°C and 1.00 atm?
(b) What is the average kinetic energy of the helium atoms?
(c) What is the root-mean-square speed of the helium atoms?


Homework Equations



P=2/3[N/V][1/2mv^2]
v=srt(3RT/M)
R=8.31
T=23.5 degrees celcius = 296.5K
M(He)=4.0026g/mol
E(int)=3/2nRT
Avogadros #: 6.0221415 × 10^23

The Attempt at a Solution


(a)I dont know how to find the # of molecules. I know I need Avogadros #.
(b)To solve this, dont I need the first one solved?
(c) v=sqrt((3(8.31)(296.5K))/4.0026 g/mol) = 42.97m/s = 0.0429km/s (which is wrong coz I did this part first)
 

Answers and Replies

Related Threads for: Atoms in a Helium Balloon.

Replies
2
Views
3K
  • Last Post
Replies
11
Views
17K
  • Last Post
Replies
0
Views
2K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
10
Views
8K
  • Last Post
Replies
1
Views
3K
Replies
5
Views
5K
Top