ok minh` dong y luon.vay bao gio cau cho to biet luon nha.Ah hoi cau mot bai to moi kiem tra xong.diem thap dang chan doi day,khi craking hoan toan 3,08g propan thu dk hon hop khi X.cho X suc cham vao 250 dung dich bromthi mat mau dung dich bromva con lai V lit khi o? DKTC co ty khoi so voi CH4 la 1,25.nong do brom va V co gia tri la?ma nay to hoi that hoc tren day co hay khong.minh khong tin tuong lam,minh muon hoc them sinh va li