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haphuong
2 năm trước
Câu1: Cần pha bao nhiêu gam dung dịch NaOH 20 % với bao nhiêu gam dd NaOH 40% để thu được 200g dd NaOH 35% Câu2: Cần pha bao nhiêu gam NaOH vào 200g dd NaOH 10% để được dd NaOH 20% EM CẦN GẤP Ạ!!! CẢM ƠN MỌI NGƯỜI
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Các câu hỏi liên quan

Hoa: Hello, Lan. Lan: Hi, Hoa. You seem happy. Hoa: I am. I received a letter from my friend Nien today. Lan: Do I know her? Hoa: I don’t think so. She was my next-door neiahbor in Hue. Lan: What does she look like? Hoa: Oh. She’s beautiful. Here is her photograph. Lan: What a lovely smile! Was she your classmate? Hoa: Oh, no. She wasn’t old enough to be in my class. Lan: How old is she? Hoa: Twelve. She’s going to visit me. She’ll be here at Christmas. Would you like to meet her? Lan: I’d love to. Answer the following questions. (Trả lời các câu hỏi sau.) Answer the following questions. (Trả lời các câu hỏi sau.) a) Where does Nien live? => b) Does Lan know Nien? => c) Which sentence tells you that Hoa is older than Nien? => d) When is Nien going to visit Hoa? =>

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