1. The pressure gauge on a 20-ft tank of nitrogen at 75 F reads 82 psi. Estimate the mass (lbm) of nitrogen in the tank by: (a) direct solution of the ideal gas law, and (b) conversion from standard conditions. (See Table 5.1 in the Course Notes.) You must work the problem in the given units (i.e., American Engineering system of units). Do not convert to the SI or any other system of units. Table 5.1. Standard Conditions for an Ideal Gas System of units SI Standard temperature, Standard pressure, Molar volume, T's Ps Vs 273.15 K 1 atm 0.022415 m/mol 273.15 K 1 atm 22.415 L/mol 491.67R 1 atm 359.05 ft/1b-mol cgs American Engineering