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B3: Cho 9,4(g) oxit kim loại R(I) phản ứng vừa đủ với dd chứa 9,8(g)axit sunfuric loãng (H2SO4). Sản phẩm thu được là muối sunfat R2SO4 và nước. a.Tim công thức của oxit trên( R2O) b. Tính khối lượng muối sunfat bằng 2 cách B4: Cho 8 (g) Fe2O3 khử bởi khí H2 thu được 3 (g) Fe. Tính H phản ứng.
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