Bài 5. Người ta đốt cháy lưu huỳnh trong bình chứa 15gam oxi. Sau phản ứng thu đc 19,2gam khí sunfurơ (SO2) a, Tính số gam lưu huỳnh đã cháy b, Tính số gam oxi còn dư sau phản ứng cháy

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