Đáp án:

Giải thích các bước giải:

Choose the correct answer A, B, C or D for each of the gaps to complete the passage:

Ha Long Bay is in Quang Ninh Province. It has many (1) ………..and caves. The islands are named after things around us. (2) ………..the bay you can find Rooster and Han Island and even Man’s Head Island. You must (3) ………..a boat ride around the islands – it’s essential! Tuan Chau is (4) ………..island in Ha Long Bay. There you can (5) ………..great Vietnamese seafood. You can watch (6) ……….. dances. You can join exciting (7) ………... Ha Long Bay is Vietnam’s most beautiful (8) ………..wonder.

1. A. rocks B. islands                   C. island                    D. lakes
2. A. On B. At                           C. In                            D. Over
3. A. to take B. taking                    C. take                        D. to taking
4. A. the biggest B. big                          C. biggest                   D. bigger
5. A. to enjoy B. enjoy                     C. enjoying                D. enjoyed
6. A. historic B. good                      C. traditional             D. difficult
7. A. activity B. acts                        C. activities               D. actions
8. A. natural B. nature                   C.  local                    D. international

   Choose the correct answer A, B, C or D for each of the gaps to complete the passage:

   Ha Long Bay is in Quang Ninh Province. It has many (1) ………..and caves. The islands are named after things around us. (2) ………..the bay you can find Rooster and Han Island and even Man’s Head Island. You must (3) ………..a boat ride around the islands – it’s essential! Tuan Chau is (4) ………..island in Ha Long Bay. There you can (5) ………..great Vietnamese seafood. You can watch (6) ……….. dances. You can join exciting (7) ………... Ha Long Bay is Vietnam’s most beautiful (8) ………..wonder.

   1. A. rocks B. islands                   C. island                    D. lakes
   2. A. On B. At                           C. In                            D. Over
   3. A. to take B. taking                    C. take                        D. to taking
   4. A. the biggest B. big                          C. biggest                   D. bigger
   5. A. to enjoy B. enjoy                     C. enjoying                D. enjoyed
   6. A. historic B. good                      C. traditional             D. difficult
   7. A. activity B. acts                        C. activities               D. actions
   8. A. natural B. nature                   C.  local                    D. international

Đáp án:bình 1 ->nH2O = 0,2

bình 2 ->nCO2 = nCaCO3 = 0,3

->nC = 0,3; nH = 0,4

nO = (mA - mC - mH)/16= 0,4 

->C : H : O = 3 : 4 : 4

khí hóa hơi: nA = nO2 = 0,05 -> MA = 104

 -> A là C3H4O4

Giải thích các bước giải: Mình đã làm trên kia rồi nên là mình khỏi giải thích bạn có hiểu không và nhớ cho tui 5 sao và ctlhn nha :33