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Cho 17.9 gam hỗn hợp Y gồm fe ,cu ,al phản ứng với H2so4 loãng dư thu dc dd A 6,4g chất rắn và 8,96 l khí B tính % khối lg mỗi Kl trong Y tính Cm các chất trong dd A biết rằng H2SO4 đã dùng có nồng độ 2M và đc lấy dư 10% so với lg cần thiết để phản ứng
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