Bài 5: Hãy xác định công thức của hợp chất khí A và gọi tên, biết rằng: _ A là oxit của lưu huỳnh chứa 50% oxi. _ Khí A nặng hơn khí metan 4 lần. Bài 6: Trong các chất sau: CuSO4, Fe2O3, Li2O ; chất nào có thành phần % theo khối lượng của oxi lớn hơn ? Hãy chứng minh. Bài 7: Người ta dùng 8,96 lit khí oxi ở đktc để đốt cháy a gam lưu huỳnh, sau khi oxi phản ứng hết thấy còn 3,2 g chất rắn. Hãy tìm giá trị của a và thể tích khí lưu huỳnh đioxit đã sinh ra.

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