Question

chemistry

87. Hydrofluoric acid solutions cannot be stored in glass containers because HF reacts readily with silica in glass to produce hexafluorosilicic acid (H SiF). SiO2(s) + 6HF(aq) → H SiF (aq) + 2H2O(l). If 40.0 g SiO2 and 40.0 g of HF react a. determine the limiting reactant. b. determine the mass of the excess reactant. c. determine the theoretical yield of H SiF. d. determine the percent yield if the actual yield is 45.8 g H SiF

Answer 1

solution - molor mars afsio2 = 60-19/mol and HF = 20.01 g/mol SO2 g + 6HP) —— Kis feey +2 Мар 0 According to an Tamus во-19 120-ося 1чч - Іь 1 Сем чозча 2 a. Lemiling reaget :- Smu 120 - ова не е-ож, бо-la s on : Чоа не о:11 ac/- ол - бруч» 1 from = 14-4342 but given for = 40g 12p - D6 He is the demiting reagent while fioz is excurs reagert b. mars of . mars of exers reacket : Initial mass-mass reached 7 Ир — 19:439 = 12o-o66

c. Theoreti Gl yield af Hz Si fo: with the help of têmiting reagent =) 120.06 g Hf react to produce 144.16 g Hz Sifo Hog Hf will react to produce = 144-16740 g Hz Si ff = 48.029 g H2Sifo . Theoretical yield at the fifo = 48-029 g 120.06 do actual yield=45.89 Theoretical yield= 48.029 g */ field = enter the land % yield = 95.389 % was the y