Question

24 gm of silicon dioxide were heated with 28.8 gm of magnesium. When the obtained product was treated with hydrochloric acid 6.72 litres of hydrogen measured at S.T.P. were collected. Determine the mass of isolated silicon. The reactions are, 2 Mg +SiO, 2 Mg0 +Si ; 2 Mg +Si ->Mg,Si Si + HCI no reaction ; Mg0 + 2 HCI MgCI, +H20 Mg,Si + 4 HCI -+2MgC1, +SiH,; Mg + 2HCI-,MgC1, +H, (Atomic wt: Si = 28, Mg = 24]

Answer 1

Answer:

... reaction MgO+2HCl---> MgCl2+ H2O Mg2Si +4HCl---> 2MgCl2+ Si ...