Ideal Gas Law Problem :) 1. The problem statement, all variables and given/known data A balloon is filled with helium at a pressure of 1.0 x 10^5 Pa. The balloon is at a temperature of 23°C and has a radius of 0.13 m. (a) How many helium atoms are contained in the balloon? (b) Suppose we increase the number of helium atoms in the balloon by a factor of 5, keeping the pressure and the temperature fixed. By what factor does the radius of the balloon increase? 2. Relevant equations PV=nRT i know i need the 4/3pir^3 for the volume as well 3. The attempt at a solution for part a) First off converted Temp to Kelvin. i used PV=nRT to solve for n. That answer i multiplied by 6.022x10^23. I thought that would be the correct answer but it is not. for part b) I did nx5. PV=nRT again but solved for the volume. Divided by 4/3pi and took the third root of that to find the radius. But again my answer did not come out correct. Any advice to where I might be going wrong would be awesome! Thanks!