hợp chất Z được tạo bởi 2 ng tố XY có công thức X3Y4 trong đó Y chiếm 25 phần trăm khối lượng Trong hạt nhân ng tử X có số nơtron nhìu hơn số proton là 1000 hạt .Trong hạt nhân ng tử Y có số hạt ko mang điện = vs số hạt mag điện dương .Biết rằng tổng số hạt proton tro ng phân tử Z là 70 .xác định số khối X vá Y công thức Z

1 câu trả lời

Dữ kiện số notron nhiều hơn số proton trong X là sai

Gọi số proton của X là x, của Y là Y.

-> 3x+4y=70.

Trong X số notron=x+??? -> MX=2x+???

Trong Y số notron=y -> MY=2y

-> 2y.4/((2x+???).3+2.y.4)=25%

Giải được x=; y=

???

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Mark the letter A, B, e,or D to indicate the underlined part that needs correction in each of the following questions. ( sửa lỗi luôn ạ) 51. A lot of people think that marriage women shouldn't pursue a career. A B C D 52. We must stop discrimination on people coming from the rural area. A B C D 53. My brother is good with cooking and he can cook very delicious food. A B C D 54. I guess they may be kept home doing housework and look after their chifdren, A B C D 55. Women in rural areas might be forced to work both at home but on the fields. A B C D 56. Some people think that girls shouldn't be allowed to going to university. A B C D 57. Gender discrimination should be eliminated for create equal opportunities in educationfor everyone. A B C D 58. More girls should being chosen to represent us in the School Youth Union .. A B C D 59. Both women and men should be given equal rights for education and employment. A B C D 60. This discrimination against women and girls must be abolishing. A B C D 61. Efforts should be make to offer all children equal access to education. A B C D 62. It is clear that gender differences cannot prevent a person to pursue a job. A B C D 63. Traditional women were mainly responsible to doing housework and looking after their husbands and A B C D children. 64. Doing houseworkevery day is really boring and tired. A B C D 65. In the past, women was often passive and dependent on their husbands. A B C D 66. Women usually get less pay as men for doing the same job. A B C D

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