cho 1 lượng sắt dư phản ứng vào 100ml dung dịch H2SO4, sau phản ứng thu được 3,36 lít khí H2( ở điều kiện tiêu chuẩn ) a.viết PTHH xảy ra b.tính khối lượng Fe sau phản ứng c.tính nồng độ mol của dung dịch H2SO4 đã dùng

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