If a balloon is filled with helium gas of molar mass 4x10^-3, at a pressure of 1*10^5, What is the number of moles of gas in the balloon?

To find the number of moles of gas in the balloon, we can use the ideal gas law equation:

PV = nRT

Where:
P = pressure (in Pascals)
V = volume (in m^3)
n = number of moles
R = ideal gas constant (8.314 J/(mol·K))
T = temperature (in Kelvin)

In this case, we are given the pressure (P), but we don't have the volume (V) or the temperature (T). Therefore, we cannot directly find the number of moles (n). We need additional information to solve this problem.

Please provide the volume or temperature of the balloon in order to proceed with the calculation.