Răspunsuri

2014-06-01T18:55:55+03:00
120g                x
2Mg + O2 => 2MgO
Mr=24            Mr=40
M=24g/mol     M=40g/mol

x=120g x 40g/mol x 2mol : 24 g/mol x 2 mol = 200g

R: m(MgO) = 200g
2 3 2