A. ) A goodyear blimp typically contains 5400 m cubed of helium at an absolute pressure of 1.1*10^5 Pa. The temperature of the helium is 280 K. What is the mass (in kg) of the helium of the blimp?
B. ) Estimate the spacing between the centers of neighboring atoms in a piece of solid aluminum, based on knowledge of the density (2700 kg/m^3) and atommic mass (26.9815 u) of aluminum.