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\(n_{Cu}=\frac{32}{64}=0,5mol\)
Phương trình hoá học:
\(Cu+2H_2SO_4đ,n\rightarrow CuSO_4+SO_2\uparrow+2H_2O\)
Theo PTTH: \(n_{SO_2}=n_{Cu}=0,5mol\)
\(\rightarrow V_{SO_2}\left(đktc\right)=0,5.22,4=11,2l\)
\(BaO+H_2O\rightarrow Ba\left(OH\right)_2\)
\(n_{BaO}=\frac{1,53}{137+16}=0,01mol\)
\(C\%_{Ba\left(OH\right)_2}=\frac{0,01.\left(137+16.2+2\right).100}{1,53+4,5}=28,36\%\)
1. Minh used to………………….his homework late in the evening.
A. does B. do C. doing D. did
2. If people…………………the rules, there are no more accidents.
A. follow B. take care of C. obey D. remember
3. You should………………right and left when you go across the roads.
A. see B. look C. be D. take
4. Hurry up or we can’t……………….the last bus home.
A. keep B. follow C. go D. catch
5. Lan used to go to school……………
A. with bicycle B. by foot C. in car D. by bus
6. Public………………in my town is good and cheap.
A. transport B. tour C. journey D. travel
7. ………………is not very far from here to the city centre.
A. That B. This C. It D. There
8. When there is a traffic jam, it…………………me a very long time to go home.
A. costs B. takes C. lasts D. spends
9. Mai’s dad usually drives her to school…………….her school is very far from her house.
A. but B. though C. because D. or
10. Yesterday Hoa and Lan………………….round West Lake. It took them an hour.
A. cycle B. cycles C. cycling D. cycled
Mg2O -> MgO
NaCO3 -> Na2CO3
CaCl3 -> CaCl2
K2O -> K2O
Ba2SO4 -> BaSO4
LiOH -> LiOH
Ag2O3 -> Ag2O
đúng chưa