Given the problem below, what would the first step be in solving it? How many grams of NaCl will be produced from 18.0 g of Na and 23.0 g C12?

2Na + C12 --> 2NaCI

A. Convert to moles
B. Use the mole ratio
C. Start with the given information 18 g Na and 23 g C12
D. Convert to moles

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.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?