A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table below.
Mass (g)
liquid reactant A unknown
liquid reactant B 9.0
liquid product 8.0
solid product 12.0
What is the mass of liquid reactant A?
A. 1.0 g
B. 8.0 g
C. 9.0 g
D. 11.0 g
E. 20.0 g