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23 tháng 4 2022

\(n_{Al}=\dfrac{4,5}{27}=\dfrac{1}{6}mol\)

\(n_{H_2}=\dfrac{3,36}{22,4}=0,15mol\)

\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

0,1       0,05               0,05             0,15   ( mol )

=> Al dư

\(m_{Al\left(dư\right)}=\left(\dfrac{1}{6}-0,1\right).27=1,8g\)               

\(m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1g\)

\(m_{H_2SO_4}=0,15.98=14,7g\)

Cho kim loại Al vào đ H2SO4 sau phản ứng thu được 3,36 lít khí đktc và muối nhôm sunfat và khí hidroa Viết PTHH xảy ra?b Tính khối lượng Al sau phản ứngc Tính khối lượng muối thu được và khối lượng axit đã phản ứngbody a, body button, body [type='button'], body input[type='reset'], body input[type='submit'], body [role="button"], ::-webkit-search-cancel-button, ::-webkit-search-decoration, ::-webkit-scrollbar-button, ...
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Cho kim loại Al vào đ H2SO4 sau phản ứng thu được 3,36 lít khí đktc và muối nhôm sunfat và khí hidro

a Viết PTHH xảy ra?

b Tính khối lượng Al sau phản ứng

c Tính khối lượng muối thu được và khối lượng axit đã phản ứng

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19 tháng 4 2022

2Al+3H2SO4->Al2(SO4)3+3H2

0,1----------------------0,075----0,15

n H2=0,15 mol

=>mAl=0,1.27=2,7g

=>m Al2(SO4)3=0,075.342=25,65g

19 tháng 4 2022

a) PTHH: \(2Al+3H_2SO_2\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

\(n_{Al}=\dfrac{2}{3}.0,15=0,1\left(mol\right)\)

\(m_{Al}=0,1.27=2,7\left(g\right)\)

c) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)

\(m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(g\right)\)

25 tháng 11 2023

Ta có: \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=\dfrac{1}{6}\left(mol\right)\Rightarrow m_{Al}=\dfrac{1}{6}.27=4,5\left(g\right)\)

b, \(n_{H_2SO_4}=n_{H_2}=0,25\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,25}{0,2}=1,25\left(M\right)\)

c, \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2}=\dfrac{1}{12}\left(mol\right)\)

\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=\dfrac{1}{12}.342=28,5\left(g\right)\)

8 tháng 5 2022

\(a.Al,Ag+H_2SO_4\rightarrow ChỉcóAlphảnứng,chấtrắnsauphảnứnglàAg\\ n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ TheoPT:n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\\ \Rightarrow m_{Al}=0,1.27=2,7\left(g\right)\\ \Rightarrow m_{rắnsaupu}=m_{Ag}=15,4-2,7=12,7\left(g\right)\\ b.\%m_{Al}=\dfrac{2,7}{15,4}.100=17,53\%,\%m_{Ag}=100-17,53=82,47\%\)

31 tháng 12 2021

\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: Fe + H2SO4 --> FeSO4 + H2

_____0,15<--------------0,15<---0,15

=> mFe = 0,15.56 = 8,4 (g)

=> mCu = 11,6 - 8,4 = 3,2 (g)

\(\left\{{}\begin{matrix}\%Fe=\dfrac{8,4}{11,6}.100\%=72,414\%\\\%Cu=\dfrac{3,2}{11,6}.100\%=27,586\%\end{matrix}\right.\)

mFeSO4 = 0,15.152 = 22,8 (g)

17 tháng 4 2022

a) Fe + 2HCl --> FeCl2 + H2

b) \(n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

\(n_{HCl\left(bđ\right)}=\dfrac{36,5}{36,5}=1\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl2 + H2

           0,4<--0,8<----0,4<----0,4

=> mHCl(dư) = (1-0,8).36,5 = 7,3 (g)

c) mFe = 0,4.56 = 22,4 (g)

mFeCl2 = 0,4.127 = 50,8 (g)

24 tháng 12 2022

a)

Chất rắn sau phản ứng là Cu

$Fe + H_2SO_4 \to FeSO_4 + H_2$
$n_{Fe} = n_{H_2} = \dfrac{1,12}{22,4} = 0,05(mol)$
$m_{Fe} = 0,05.56 = 2,8(gam)$

$\Rightarrow m_{Cu} = 10,5 - 2,8 = 7,7(gam)$

b) $n_{H_2SO_4} = n_{H_2} = 0,05(mol)$
$\Rightarrow m_{H_2SO_4} = 0,05.98 = 4,9(gam)$

10 tháng 12 2023

mình làm rồi nhé

10 tháng 12 2023

cái này ra âm nhé nên không tính được

24 tháng 4 2023

a, \(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\)

\(m_{HCl}=36,5.15\%=5,475\left(g\right)\Rightarrow n_{HCl}=\dfrac{5,475}{36,5}=0,15\left(mol\right)\)

PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)

Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,15}{2}\), ta được Mg dư.

Theo PT: \(n_{H_2}=\dfrac{1}{2}n_{HCl}=0,075\left(mol\right)\Rightarrow V_{H_2}=0,075.22,4=1,68\left(l\right)\)

b, \(n_{Mg\left(pư\right)}=\dfrac{1}{2}n_{HCl}=0,075\left(mol\right)\Rightarrow n_{Mg\left(dư\right)}=0,1-0,075=0,025\left(mol\right)\)

\(\Rightarrow m_{Mg\left(dư\right)}=0,025.24=0,6\left(g\right)\)

c, - Cách 1:

\(n_{MgCl_2}=\dfrac{1}{2}n_{HCl}=0,075\left(mol\right)\Rightarrow m_{MgCl_2}=0,075.95=7,125\left(g\right)\)

- Cách 2: 

Theo ĐLBT KL, có: mMg (pư) + mHCl = mMgCl2 + mH2

⇒ mMgCl2 = 2,4 - 0,6 + 5,475 - 0,075.2 = 7,125 (g)

24 tháng 4 2023

8====D

có cứt nhá

có làm mới có ăn