Question

what mass of pure silicon can be produced by the reaction of 63.7g of Mg and 36.7g of SiCl4(l)?

Answer 1

2Mg + SiCl4 -> Si + 2MgCl2
Mol of Mg: 63.7/24.3 =2.62mol (excess)
Mol of SiCl4: 36.7/(28+35.5x4) =0.22mol
Mol of pure silicon produce =0.22mol
mass of pure silicon produce =0.22 x28 =6.16g

Answer 2

Please explain how the Mol of pure Silicon produce is 0.22 mol