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2 năm trước
Lập CTHH của các hợp chất: a) A gồm 40% Cu, 20% S, 40% O, bt khối lg mol của A là 160. b) B gồm 82,35% N và 17,65% H, bt khối lg mol của B là 17. c) C gồm 32,39% Na, 22,53% S và O, bt khối lg mol của C là 142. d) D gồm 36,8% Fe, 21% S còn lại là O, bt khối lg mol của D là 152.
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