Problem 3) A block of density b=20kg/m3 and volume Vb=1m3 sits in a sealed tank of Area A=2m2, and height h=.5m. The tank is filled with compressed air, molecular weight M=29g/mol. The block sits on a scal that reads Fs=90N. Assume the scale has negligible volume. a) How many moles of gas in the tank [mol]? (45,000 pts) b) If all else is equal (including the scale reading), except the volume of the block is doubled, now how many moles of gas are in the tank [mol]? (45,000pts) hint: just replace Vb with 2Vb in the formula derived in part a)