SiO2 + HF -> H2SiF6 + H2O a. Write the balance equation. b. Determine the mass of H2SiF6 from 40.0 g of SiO2.

Answer 1

SiO2 + 6HF ====== > H2SiF6 + 2 H2O

The conversion factor for grams SiO2 to grams H2SiF6 is mol. mass H2SiF6 / mol. mass SiO2 =

144.1 / 60.1 = 2.40. Multiply this conversion factor by 40.0 g SiO2 to get 96.0 g H2SiF6.