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VL
2
11 tháng 4 2022
\(n_{FeS_2}=\dfrac{240}{120}.80\%=1,6\left(mol\right)\)
PTHH: 4FeS2 + 11O2 --to--> 2Fe2O3 + 8SO2
1,6 -------------------------------> 3,2
2SO2 + O2 --to--> 2SO3
3,2 --------------------> 3,2
SO3 + H2O ---> H2SO4
3,2 ----------------> 3,2
\(m_{ddH_2SO_4}=\dfrac{3,2.98}{49\%}=640\left(g\right)\)
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DT
Đỗ Thanh Hải
CTVVIP
19 tháng 10 2021
1 Sue wishes she hadn't bought that new book
2 Unless you walk faster, you will be late
3 Carol spent 2 hours fixing the television sets
4 I make these handicrafts by myself
5 If I were you, I would take the bus instead of the train
II
1 She doesn't have to get up early on Saturday
2 Children mustn't be left alone in car
3 John must explain this if he want his student to succeed
4 I have to file the report this week
5 We don't have to work overtime on Saturdays
6 You mustn't drive more than 25 mph in this zone
7 She didn't have to attend the presentation yesterday
8 She has to pick up her children at school
9 You don't have to arrive before 8
10 They had to visit the doctor yesterday as they didn't feel well
pollution
amazing
why didn't hoa go to school yesterday - Because she had a bad cold
What kind of movies do you enjoy - mostly comedies
How many people atted .... - more than 6 million
are people's lives.... - Yes of course
Do you think ... - I think population...
22.pollution
23.amazed
24.
1 vàng với 2 xanh
2 vàng với 1 xanh
3 vàng với 5 xanh
4 vàng với 4 xanh
5 vàng với 3 xanh
tui kh bic cậu còn cần kh nhma đây nhéeeee