Which statement is a correct expression of the law of conservation of mass?
a. the total mass is unpredictable in a chemical reaction.
b. the total mass remains the same during a chemical reaction.
c. the total mass decreases during a chemical reaction.
d. the total mass increases in a chemical reaction.

Qand k are only the same when the forward rate of the reaction has reached zero.

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.