user-avatar
otran0123456789
2 năm trước
Cho hỗn hợp X gồm O2 O3 có tỉ khối so với H2 là 19,2 Đốt cháy hoàn toàn 25,38 g hỗn hợp y gồm Al và Cu cần vừa đủ 6,72 l hỗn hợp X thu được hỗn hợp z gồm CuO và Al2O3 tính phần trăm khối lượng CuO trong Z
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

VI. Đoc lá thư. Sau đó trả lời câu hỏi. July 2nd Dear Tim, Thanks for your letter. I am very glad to hear that you are fine. I am fine, too. It’s really interesting to know about vacations of America students. You are right. We have fewer vacations than American students. Each year, we just have about four vacations. We have a day off for Independent Day on September 2nd, two days off on April 30th and May Day. Our most important vacations is Tet. Tet holiday often lasts for nine or ten days. Our longest vacation is summer vacation. It lasts for almost three months. We usually spend time with our families. We don’t have vacations for Easter, Thanksgiving and Christmas, but we also celebrate them. Please write and tell me your last summer vacation. Your friend, Hoa. 1. Do Vietnamese students have more or fewer vacations than American students? 2. How many vacations do Vietnamese students have? What are they? 3. Which vacation is the longest? 4. Which vacation is the most important? _________________________________________________________________________ 5. How long does Tet holiday last? _________________________________________________________________________ 6. What does Hoa do during her vacations? _________________________________________________________________________ 7. Do Vietnamese students have Christmas vacation? ............................................................................................

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