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thuchanhtamly186
2 năm trước
Để 17,92 gam phôi sắt ngoài không khí một thời gian thu được hỗn hợp X gồm Fe và các oxit Fe. Hòa tan hết X trong dung dịch HCl loãng dư thu được dung dịch Y chứa 44,9 gam muối và 1,792 lít khí H2 (đktc). Mặt khác hòa tan hết X trong 230 gam dung dịch HNO3 31,5% thu được dung dịch Z. Cho 620 ml dung dịch NaOH 1,5M vào dung dịch Z thu được 32,1 gam kết tủa duy nhất. Xác định Nồng độ C% của muối sắt có trong dung dịch Z
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