Biết 7,6g hỗn hợp N2 và O2 ở đktn chiếm thể tích 13,44 lít. Tính số mol mỗi khí? (Cần giải gấp ạ )

Chọn đáp án đúng để điền vào đoạn văn. First-Born Baby Custom Normally in Viet Nam especially in the countryside regions, three (11) _______ live under the same roof. Based on Confucianism telnet, when a girl gets marriage she has to follow her husband and live in her husband family. It has some (12) _______ for the wife when she is (13) _______ and has baby at the first time. The first-born baby custom means the wife comes back to her family to have the first-born baby, and from the second child she stays (14) _______ her husband's family. This custom is popular in Binh Tri Thien and some other (15) _______ in the north of Viet Nam. In Nghe An, Ha Tinh unless the husband lives in his wife's family in general the wife must not go to her family to have a baby. Why Vietnamese has first-born baby custom? Because in the past the married age is young, (woman from thirteen and man from sixteen can get married), and when a young wife has a baby (16) _______ the first time, she does not have any experiences during pregnancy. Furthermore, she still hesitates to depend on her mother-in-law, her sister-in-law for help and it would be easier to ask for help from her mother and her sister. Next time having a baby she has experiences, she can (17) _______ with difficulties by herself so she can stay at her husband's family. Some days before confinement, the parent-in-law or the husband goes to the wife's family to talk with the wife's parents to take the wife come back her family. After confinement, the baby is strong enough. The husband prepares some presents (18) _______ pick her wife up and take her to his home. The grandparent-in-law of the baby is very careful to mark a smut on baby's forehead to (19) _______ ghost away on the way coming home. Contrary to above custom, in Ha Tinh only the daughters-in-law can have baby at the family. If the wife is staying at her house and cannot come back to her husband's family, her parents have to pitch a tent temporarily for her to have a baby or she has to go to buffalo cage outside the house. In (20) _______ the wife is motherless, she stays at her husband's family to have a baby as normal.

Thửa ruộng hình chữ nhật có chu vi là 320m.Chiều dài gấp 3 lần chiều rộng.Cứ 100m² là 70kg thóc.Hỏi cả thửa ruộng được bao nhiêu ki-lô-gam thóc ?

Mn giúp mình nha mẹ mình ung thư mình k có tâm trạng làm luôn á:(((

Cho đoạn văn: "Cái ấn tượng khắc sâu...vừa bước vào..." (Văn bản "Cổng trường mở ra" SGK Ngữ văn lớp 7) Câu 1: Trình bày cảm nhận của em về nhân vật người mẹ trong văn bản. KO CHÉP MẠNG NHE! Viết hay hay chút để đc vote 5* nhe

$\sqrt{6,8^2 - 3,2^2}$ Tớ sẽ bl và hỏi

GIẢI PHƯƠNG TRÌNH : cos ²2x + 2(sinx + cosx) ³ - 3sin2x - 3 = 0

1. A=1/3x5 + 1/5x7 + 1/7x9 + .... +1/45x47 + 1/47x49 2.tìm hai số có tổng là 703 biết 2/3 số thứ 1 bằng 3/5 số thứ 2(làm theo cách quy đồng tử)

Lúc 7 giờ sáng, một ô tô khởi hành từ A đến B với vận tốc không đổi 72km/h như hình vẽ. Chọn gốc thời gian lúc 8 giờ sáng, gốc tọa độ O cách A 100m, chiều dài từ A đến B dương. Viết phương trình chuyển động của ô tô

vẽ mầm cute cười nham hiểm Nl: nhìn hình đi hahaha... :)))