Hoà tan 4,8 gam mg và dd hcl 2M đủ a) tính thể tích khí tại thành ở đktc b) tính thể tích dd Hcl đã dùng Giúp vs mn

2 câu trả lời

Đáp án:

 mình gửi đáp án

Giải thích các bước giải:

 a) PTHH: Mg+2HCl->MgCl2+H2

ta có: nMg=4,8/24=0,2mol

theo PT: nMg=nH2=0,2mol

=>VH2=0,2.22,4=4,48 lít

b) theo PT: 2nMg=nHCl =>nHCl=2.0,2=0,4mol

=>V dd HCl=0,4/2=0,2 lit

Em tham khảo nha :

\(\begin{array}{l}
a)\\
Mg + 2HCl \to MgC{l_2} + {H_2}\\
{n_{Mg}} = \dfrac{{4,8}}{{24}} = 0,2mol\\
{n_{{H_2}}} = {n_{Mg}} = 0,2mol\\
{V_{{H_2}}} = 0,2 \times 22,4 = 4,48l\\
b)\\
{n_{HCl}} = 2{n_{Mg}} = 0,4mol\\
{V_{HCl}} = \dfrac{{0,4}}{2} = ,2l = 200ml
\end{array}\)

 

Câu hỏi trong lớp Xem thêm

1. If I were you, I __________ for a new car to buy. A. would look B. will look C. look D. looking 2. If Trang __________ ill, she would go out with us. A. isn’t B. aren’t C. wasn’t D. not been 3. If there __________ fewer cars on the road, there would be less accident. A. is B. were C. are D. be 4. If people really cared about environment, they __________ waste into rivers. A. didn’t dump B. don’t dump C. shan’t dump D. wouldn’t dump 5. You __________ so tired if you went to bed earlier. A. won’t be B. shan’t be C. couldn’t be D. wouldn’t be 6. If you really __________ me, you would buy me a diamond ring. A. loved B. love C. loves D. loving 7. If I knew where she lived, I __________ and see her. A. will go B. would go C. should go D. went 8. If I __________ taller, I would buy this dress. A. am B. are C. were D. being 9. Filters do not remove all __________ from water. A. contaminate B. contaminants C. contaminating D. contamination 10. __________ is found under the ground in soil, rocks, etc. A. sea water B. salt water C. groundwater D. hot water 11. If I won a lottery, I __________ a lot on charity. A. spend B. spent C. will spend D. would spend 12. If the supermarket is open, I __________ some food there. A. will buy B. would buy C. bought D. has bought 13. I will talk to her if you __________ to do it. A. won’t want B. didn’t want C. don’t want D. doesn’t want 14. If I __________ more money, I would buy a better car. A. have B. had C. will have D. would have 15. The farmer had put down some rat __________. A. poisoning B. poisoner C. poisoned D. poison

0 lượt xem
1 đáp án
2 phút trước