Question

6HF + SiO2 → H2SiF6 + 2H2O

Identify the limiting reactant and excess reactant if 45 moles of SiO2 and 140 moles of HF react. (calculate grams of H2O)

Answer 1

well, you will need 6*45 = 270 moles of HF for that much SiO2.