Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.

Unbalanced chemical equation of synthesizing cryolite:

Al₂O₃ + NaOH + HF → Na₃AlF₆ + H₂O.

Balanced chemical equation:

Al₂O₃ + 6NaOH + 12HF → 2Na₃AlF₆ + 9H₂O.

According to principle of mass conservation, number of atoms must be equal on both side of balanced chemical reaction.  

There are two aluminium atoms (Al), six sodium atoms (Na), eighteen hydrogen atoms (H), nine oxygen atoms (O) and twelve fluorine atoms (F) on both side of balanced chemical reaction.

answer; talc and gypsum;