1 People walked to school every day due to the fact that there were no cars

2 She has the ability to understand the main idea of English texts now

3 I came across an old photo of my aunt by chance while I was cleaning

1 She used to wear special dress at family gatherings when she was a kid

2 He usually takes notes in class because of his need to remember everything

KL tungsten (Wolfram) có nhiệt độ nóng chảy cao nên được sử dụng trong sợi dây bóng đèn.

a, PT: \(Cu+2AgNO_3\rightarrow Cu\left(NO_3\right)_2+2Ag\)

_______a_______2a_________________2a (mol)

Ta có: m _tăng = m_Ag - m_{Cu (pư)} 

⇒ 3,04 = 2a.108 - 64a

⇒ a = 0,02 (mol)

⇒ m_Cu = 0,02.64 = 1,28 (g)

m_Ag = 0,02.2.108 = 4,32 (g)

b, \(C_{M_{AgNO_3}}=\dfrac{0,02.2}{0,2}=0,2\left(M\right)\)

Ta có: \(n_{CO_2}=\dfrac{14,6}{44}=0,33\left(mol\right)\)

\(n_{H_2O}=\dfrac{10,8}{18}=0,6\left(mol\right)\)

⇒ n_alkane = 0,6 - 0,33 = 0,27 (mol)

Gọi CTPT cần tìm là C_nH_2n+2

\(\Rightarrow n=\dfrac{0,33}{0,27}=1,2\)

Số bị lẻ nên bạn xem lại đề nhé.

\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)

\(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)

\(AlCl_3+3AgNO_3\rightarrow Al\left(NO_3\right)_3+3AgCl\)

\(Al\left(NO_3\right)_3+3NaOH\rightarrow3NaNO_3+Al\left(OH\right)_3\)

\(2Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\)

\(Al_2\left(SO_4\right)_3+3BaCl_2\rightarrow2AlCl_3+3BaSO_4\)

\(2AlCl_3+3Mg\rightarrow3MgCl_2+2Al\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)