điền tiếp từ vào chỗ trống

dear mom and dad,

hi. i'm on (0) HOLIDAY in viet nam with ted and bob . we (1) ARRVIED in da lat yesterday. it is a very beautiful city and is (2) KNEW as the city of eternal spring . da lat is very famous for its (3) WATERFALL, lakes , and flowers gardens. the first two day the weather was fine , warm and sunny , so we did some (4) SIGHTING i took a lot of photos . on thursday we went shopping.everything was cheap , so we bought lots of (5)SOUNEVIRS and two nice sweaters for you. in the evening we had (6) DINNER at a lovely little restaurant and then went to a coffeehouse to (7)E.....trung nguyen coffee.last night we went to the theater and didn't get back (8) UNTIL 11pm. so we got up late this morning and (9) DECIDE to have a ralaxing day at the hotel, so that's (10) WONDERFUL i'm now

Hòa tan hoàn toàn 19,36 gam hỗn hợp X gồm Fe, FeCO₃, Fe₂O₃ bằng dung dịch HNO₃ dư thu được dung dịch Z và 0,27 mol hỗn hợp khí gồm NO₂, CO₂. Nếu cho cùng lượng X tác dụng với dung dịch H₂SO₄ đặc, nóng dư thì thu được 0,165 mol hỗn hợp CO₂, SO₂. Phần trăm khối lượng của Fe₂O₃ trong X gần nhất với giá trị nào sau đây?

A. 20%.

B. 30%.

C. 40%.

D. 50%.