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a) Fe + H2SO4 → FeSO4 + H2
b) n Fe = n H2 = 4,48/22,4 = 0,2(mol)
m Fe = 0,2.56 = 11,2(gam)
c) n H2SO4 = n H2 = 0,2(mol)
=> CM H2SO4 = 0,2/0,2 = 1M
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BAI 1 ME CO 30 CAI KEO ME CHIA DEU CHO 5 HAI ANH EM HOI ME DA DEU VAO BAO NHIEU CAI KEO VAY CAC BAN GAY LAM HO MINH BAI NAY NHE
số kẹo mẹ chia đều cho 5 anh em là
30:5=6 ( cây kẹo )
đáp số 6 cây kẹo
e đánh dấu được ko
7k voi k€n
Moi nguoi giup mik bai nay voi cai nay cua bai uoc chung va boi chung cua Sbt nha
Ai giup mik thi mik se like
Viet nam noi la lam
1 nguoi cong nhan lam 30 cai dinh oc trong 45 phit . hoi trong 1 gio 15 phut ho lam duoc bao nhieu cai dinh oc
1 cái đinh làm trong:
45:30=1,5(phút)
Đổi: 1 giờ 15 phút=75 phút
Trong 75 phút làm được:
75:1,5=50(cái đinh ốc )
Vậy : Trong 1 giờ 15 phút người công nhân đó làm được 50 cái đinh ốc.
Đáp số: 50 cái đinh ốc
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Một cái đinh làm trong:
45 : 30 = 1,5 (phút)
Đổi: 1 giờ 15 phút = 75 phút
Trong 75 phút làm được:
75 : 1,5 = 50 (cái đinh ốc)
Vậy: Trong 1 giờ 15 phút người công nhân đó làm được 50 cái đinh ốc.
Đáp số: 50 cái đinh ốc
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co 200 cai keoma cho di 123 cai keo.hoi con lai bao nhieu cai keo
bao lam ra bai nay ^
|
Còn lại số cái kẹo là:
200 - 123 = 77 (cái kẹo)
Đáp số: 77 cái kẹo
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lam ho mk nha cai cuoi ko can
giai ho mik cai kho que1. They ______a new flat Before they ( move ) …………here (buy)2. We ______our holiday yet. (not/ plan)3. Mr Lam just ______ out for 2 hours (go)4. I ______ my plan 2 hours ago (not/finish)5. ______ he ______ this lesson yet? ( learn)6.There is she? I (wait)______ for her since 5 o’clock!7. It’s 9 am today . We ( go ) …………on a pinic8. How long you (study) ______ English? For 5 years9. Why are your hands so dirty? – I (repair)______ my bike10. I (go) ______ home after...
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giai ho mik cai kho que
1. They ______a new flat Before they ( move ) …………here (buy)
2. We ______our holiday yet. (not/ plan)
3. Mr Lam just ______ out for 2 hours (go)
4. I ______ my plan 2 hours ago (not/finish)
5. ______ he ______ this lesson yet? ( learn)
6.There is she? I (wait)______ for her since 5 o’clock!
7. It’s 9 am today . We ( go ) …………on a pinic
8. How long you (study) ______ English? For 5 years
9. Why are your hands so dirty? – I (repair)______ my bike
10. I (go) ______ home after I (finish) ______ their work.
11. His train ( leave ) ………………..here 6.am tomrorrow
12. After taking a bath, she (go) ______ to bed.
13. It was very noisy next door. Our neighbours ….(have) a party.
14. Hoa and I went for a walk. I had difficulty keeping up with her because she … (walk) so fast
15. Tim was sitting on the ground. He was out of breath. He … (run)
16. When Phuong arrived, everybody was sitting round the table with their mouths full. They … (eat)
1. They __had bought____a new flat Before they ( move ) …moved………here (buy)
2. We __have not planed____our holiday yet. (not/ plan)
3. Mr Lam has just ___gone___ out for 2 hours (go)
4. I ___did not finished___ my plan 2 hours ago (not/finish)
5. __Has____ he ___learned___ this lesson yet? ( learn)
6.There is she? I (wait)_have waited_____ for her since 5 o’clock!
7. It’s 9 am today . We ( go ) …are going………on a pinic
8. How long have you (study) __ been studying____ English? For 5 years
9. Why are your hands so dirty? – I (repair)___was repairing___ my bike
10. I (go) __will go____ home after I (finish) __finish____ their work.
11. His train ( leave ) …will leave……………..here 6.am tomrorrow
12. After taking a bath, she (go) __went____ to bed.
13. It was very noisy next door. Our neighbours …were having..(have) a party.
14. Hoa and I went for a walk. I had difficulty keeping up with her because she ...was walking … (walk) so fast
15. Tim was sitting on the ground. He was out of breath. He ..was running… (run)
16. When Phuong arrived, everybody was sitting round the table with their mouths full. They ...were eating… (eat)
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