5. A tank of propane, GHs, being used for a gas grill, has a volume of 20.0L. At STP, how many molecules of propane occupy the tank?

Answers are 1,2,4 its correct on edgenuity.

It will appear as o2(g) as a reactant 

The reaction 2kalsi3o8 + 2(h+ + hco3-) + h2o  →  al2si2o5(oh)4 + 2k+ + 2hco3- + 4sio2 shows that feldspar kalsi3o8 is chemically altered by hydrolysis to form chalky-looking clay mineral kaolinite al2si2o5(oh)4. the chemical breakdown of potassium feldspar due to exposure to acidic water results to the mineral binding with the water molecule to become kaolinite with silica and potassium and bicarbonate ions in solution.