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thuygiangloga
2 năm trước
a) Để hoà tan 4 gam Fe x O y cần 52,14 ml dung dịch HCl 10% (d = 1,05 g/ml). Xác định công thức phân tử sắt oxit trên. b) Cho oxit M x O y của kim loại M có hoá trị không đổi. Biết rằng 3,06 gam M x O y nguyên chất tan trong HNO 3 dư thu được 5,22 gam muối. Hãy xác định công thức của oxit trên
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