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naggii1234
2 năm trước
Hòa tan 12 gam hỗn hợp Fe và Cu bằng một lượng vừa đủ 200 ml dd HCI. Sau phản ứng thu được 2,24 lít H2 ở đktc. a. Viết phương trình phản ứng xảy ra. b. Tính nồng độ mol của dd HCl đã dùng. c. Tính thành phần % theo khối lượng mỗi kim loại trong hỗn hợp ban đầu. Giúp mik vs các bn mik xin trân trọng cảm ơn
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3/.Many people think that student have an easy life: we only work a few hours a day and have long vacations. They don't know we have to work hard at school and at home. Take a look at a typical grade 7 student like Hoa. She has five periods a day, six days a week. That is about 20 hours a week-fewer hours than any worker. But that is not all. Hoa is a keen student and studies hard. She has about 12 hours of homework every week. She also has to review her work before tets. This makes her working week about 45 hours.This is more than some workers.Students like Hoa are definitely not lazy! 1/why do some people think that students have an easy life ? 2/how many hours a week does Hoa work ?Is this fewer than most workers? 3/How many hours a week do you work? Is that more or fewer hours than Hoa? 4/Does the write think students are lazy?

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