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nhithuc132
2 năm trước
Câu 27: Độ tan của NaCl trong nước ở 200C là 36g. Khi mới hoà tan 16g NaCl vào 50g nước thì phải hoà tan thêm bao nhiêu gam NaCl nữa để dung dịch bão hoà. A. 1g B. 2g C. 3g D. 4g Câu 28: Số g chất tan cần để pha chế 2 lit dung dịch NaCl 0,9M là A. 105,3g B. 10,53g C. 1,8g D. 18g Câu 29: Để khử hoàn toàn 19,2 gam hỗn hợp gồm CuO và FeO ở nhiệt độ cao, cần dùng 5,6 lít khí H2 (đktc). Khối lượng mỗi chất trong hỗn hợp ban đầu lần lượt là A. 10g và 9,2g B. 12g và 7,2 g C. 7,2g và 12g D. 9,2g và 10g Bài 30: Cho 3,6 gam oxit của một nguyên tố kim loại hóa trị II tác dụng với dung dịch HCl dư, sau phản ứng thu được 6,35 g muối clorua. Nguyên tố kim loại đó là A. Ca B. Mg C. Cu D. Fe (Cho: Fe=56; Cu=64; Mg=24; Ca=40; O=16; Na=2
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