(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?
T=23.5 degrees celcius = 296.5K
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)