user-avatar
quangbale
2 năm trước
Hỗn hợp bột X gồm Fe và Cu . Cho m gam X tác dụng với dung dịch CuSO4 dư. Kết thúc phản ứng, thu được (m+1,2) gam chất rắn khan. Cũng m gam X nói trên phản ứng hết với dung dịch H2SO4 đặc , nóng thu được 94 gam dung dịch Y và 6,384 lít khí SO2( sản phẩm duy nhất , ở đktc) . Biết trong Y lượng axit dư có nồng độ 44,83% và giả sử nước không bay hơi trong quá trình phản ứng . Tính m và nồng độ phần trăm của H2SO4 ban đầu
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Exl : Read the passage and choose the best answer. Fun Facts About the Saxophone A relatively new-kid-on-the block as instruments go, the saxophone... (74) invented less than 200 years ago! Here is a short sampling of facts about this versatile instrument. While typically constructed of brass, the saxophone is.. .(75) a member of the woodwind family. The sax earns this classification because of the way sound is produced: a player's embouchure creates an airtight seal over the mouthpiece, vibrating a single reed in the manner of a clarinet. Brass instruments,... buzzing one's lips on the rim of the mouthpiece. (76) contrast, are played by Despite the previous statement that saxes are usually made of brass, there are exceptions. Some (77) such as bronze, copper, or models are made partially (or even entirely) of more precious sterling silver. A few models of plastic saxophones have been produced over the years. In the 1950s and 1960s, acrylic plastic alto saxes were popularly available under the brand name Grafton. The bodies of these instruments were.... .(78) of then state-of-the-art injection-molded plastic, the keys being made of metal. Famous players known to occasionally perform on Grafton saxophones include Charlie Parker and Ornette Coleman. One of the most important.. (79) of a saxophone's sound is the mouthpiece a player uses. On the subject of unusual materials, saxophone mouthpieces were originally made of wood. At first, they were made (80) harder wood such as granadilla and rosewood. out of softer woods such as boxwood and later,

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team