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nhan2452005
2 năm trước
Nung nóng hh gồm 11,2g bột Fe và 3,2g bột lưu huỳnh.Cho sản phẩm tạo thành vào 200ml dd H2SO4 thù thu được hh khí A bay ra và dd B ( Hpư = 100%) a) tìm % thể tích của hh A. b) để trung hòa dd B phải dùng 200ml dd KOH 2M.Tìm Cm của dd H2SO4 đã dùng.
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