giúp mìn zới ạ
mìn còn câu cúi thoii , mn giúp mìn zới :33
giúp mìn zới
giúp mìn zới :<<
Giúp mìn zới 😘🙆♀️
Ta có: \(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH:
CaCO3 + 2HCl ---> CaCl2 + CO2 + H2O (1)
CaO + 2HCl ---> CaCl2 + H2O
a. Theo PT(1): \(n_{CaCO_3}=n_{CO_2}=0,15\left(mol\right)\)
=> \(m_{CaCO_3}=0,15.100=15\left(g\right)\)
=> \(\%_{m_{CaCO_3}}=\dfrac{15}{17,8}.100\%=84,27\%\%\)
\(\%_{m_{CaO}}=100\%-84,27\%=15,73\%\)
b. Ta có: \(m_{CaO}=17,8-15=2,8\left(g\right)\)
=> \(n_{CaO}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
Theo PT(1): \(n_{HCl}=2.n_{CaCO_3}=2.0,15=0,3\left(mol\right)\)
Theo PT(2): \(n_{HCl}=2.n_{CaO}=2.0,05=0,1\left(mol\right)\)
=> \(n_{HCl_{PỨ}}=0,3+0,1=0,4\left(mol\right)\)
Đổi 200ml = 0,2 lít
=> \(C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\)
tính hóa trị của cocl2, fe2 ( 2 lần ) < làm ưn giúp mìn zới cảm ơn trước>
Hãy kể lại một câu chuyện vô cảm gây ra sự đau lòng mà em biết ( kết hợp yếu tố miêu tả nội tâm, miêu tả, nghị luận) Giúp mìn zới nha mìn sắp thi rồi😢😢
cho mìn hỏi bài zới bài có tên: 254:x=149 dư 16)
mong mọi người giúp
254:x=14( dư 16)
x=(254-16):14
x=17
HT
thank you bé sói nha
good night
676,87*78,9=? cho bé sói nha
mọi người help mìn zới :<<
Bài 5:
5: Ta có: \(1-\sqrt{x^2-2}=0\)
\(\Leftrightarrow x^2-2=1\)
hay \(x\in\left\{\sqrt{3};-\sqrt{3}\right\}\)
giúp mìn với ạ mìn đang cần gấp !!!!
1 She said that she was coming
2 She said that she wouldn't see me the following day
3 She said that he worked in a bank
4 She said that he was living in Paris for a few months
5 Lan said that she would be very busy the next day
6 Thu said that all the students would have a meeting the following sunday
7 Tam said that she could swim acroos that river
8 His sister said that she didn't buy that book
9 The boy said that they had to try their best to win the match
10 Her father said to her that she could go to the movies with her friends
11 Her classmate said that Lan was the most intellligent girl in their class
12 The teacher said that the sun rised in the east