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huongdam1511
2 năm trước
Câu 1 (2 điểm): Từ Mn0 , dung dịch HCl, KClo, và cacbon, viết phương trình hóa học để điều chế các khí: clo,oxi, cacbon đioxit. Câu 2 (2 điểm): Tính thể tích khí oxi thu được (đktc) khi nhiệt phân 15,8 gam KMnO4 với hiệu suất 85% (K = 39,Mn = 55,0 = 16). Câu 3 (2 điểm): Cho m gam So, vào 20 gam dung dịch H2SO4 10% dung dịch H2SO4 20%. a) Viết phương trình hóa học của So với H20. b) Tìm giá trị của m (H = 1,0 = 16, S = 32)
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