viết tích sau thành tổng
6* h =
2*d=
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\(m_{HCl}=50.7,3\%=3,65\left(g\right)\\ n_{HCl}=\dfrac{3,65}{36,5}=0,1\left(mol\right)\\ PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=n_{H_2}=n_{ZnCl_2}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\\ m_{Zn}=0,05.65=3,25\left(g\right)\\ V_{H_2\left(ĐKTC\right)}=0,05.22,4=1,12\left(l\right)\\ m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
mHCl=50.7,3%=3,65(g) -> nHCl=0,1(mol)
a) PTHH: Zn + 2 HCl -> ZnCl2 + H2
nH2=nZnCl2=nZn=nHCl/2= 0,1/2=0,05(mol)
b) m=mZn=0,05.65=3,25(g)
c) V(H2,đktc)=0,05.22,4=1,12(l)
d) mZnCl2= 136.0,05= 7,8(g)
viết gọn các tích sau thành luỹ thừa:
a)2.3.6.6.6=
b)4.4.5.5.5=
c)2.2.2.8.4=
d)10.10.4.5.5=
e)8.8.4=
a) 2.3.6.6.6 = 2^1 * 3^1 * 2^1 * 3^1 * 2^1 * 3^1 = 2^3 * 3^3
b) 4.4.5.5.5 = 2^2 * 2^2 * 5^1 * 5^1 * 5^1 = 2^4 * 5^3
c) 2.2.2.8.4 = 2^1 * 2^1 * 2^1 * 2^3 * 2^2 = 2^8
d) 10.10.4.5.5 = 2^1 * 5^1 * 2^1 * 5^1 * 2^2 * 5^2 = 2^4 * 5^4
e) 8.8.4 = 2^3 * 2^3 * 2^2 = 2^8
a) \(2.3.6.6.6=2.3.6^3=2.3.2^3.3^3=2^4.3^4\)
b) \(4.4.5.5.5=4^2.5^3=2^4.5^3\)
c) \(2.2.2.8.4=2^2.2^3.2^2=2^7\)
d) \(10.10.4.5.5=2.5.2.5.2^2.5^2=2^4.5^4\)
e) \(8.8.4=2^3.2^3.2^2=2^8\)
7^56 = 7^ ( 6 +50) = 7^6 . 7^50
14^7 = ( 2.7)^7 = 2^7 . 7^7
10^15 = ( 2.5 )^15 = 2^5 . 5^15
27^7 = ( 3.9)^7 = 3^7 . 9^7
35^9 = ( 5.7 )^9 = 5^9 . 7^9
12^5 = ( 3.4 )^5 = 3^5 . 4^5
14^3 = ( 2.7 )^3 = 7^3 . 2^3
a) C2H4 + Br2 --> C2H4Br2
C2H2 + 2Br2 --> C2H2Br4
b) Gọi số mol C2H4, C2H2 là a, b (mol)
=> a + b = \(\dfrac{1,68}{22,4}=0,075\left(mol\right)\) (1)
\(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)
=> a + 2b = 0,1 (2)
(1)(2) => a = 0,05 (mol); b = 0,025 (mol)
=> \(\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,05}{0,075}.100\%=66,67\%\\\%V_{C_2H_2}=\dfrac{0,025}{0,075}.100\%=33,33\%\end{matrix}\right.\)
c)
PTHH: C2H4 + 3O2 --to--> 2CO2 + 2H2O
0,05--->0,15
2C2H2 + 5O2 --to--> 4CO2 + 2H2O
0,025-->0,0625
=> VO2 = (0,15 + 0,0625).22,4 = 4,76 (l)
a.b.\(n_{Br_2}=\dfrac{16}{160}=0,1mol\)
\(n_{hh}=\dfrac{1,68}{22,4}=0,075mol\)
Gọi \(\left\{{}\begin{matrix}n_{C_2H_2}=x\\n_{C_2H_4}=y\end{matrix}\right.\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
x 2x ( mol )
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
y y ( mol )
Ta có:
\(\left\{{}\begin{matrix}22,4x+22,4y=1,68\\2x+y=0,1\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,025\\y=0,05\end{matrix}\right.\)
\(\%V_{C_2H_2}=\dfrac{0,025}{0,075}.100=33,33\%\)
\(\%V_{C_2H_4}=100\%-33,33\%=66,67\%\)
c.
\(2C_2H_2+5O_2\rightarrow\left(t^o\right)4CO_2+2H_2O\)
0,025 0,0625 ( mol )
\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)
0,05 0,15 ( mol )
\(V_{O_2}=\left(0,0625+0,15\right).22,4=4,76l\)
x^2+5x+6=x^2+4x+x+2+4=(x^2+4x+4)+(x+2)=(x+2)^2+(x+2)=(x+2)(x+3)
Nhớ ủng hộ nha
\(^{x^2+5x+6=x^2+2x+3x+6=x\left(x+2\right)+3\left(x+2\right)=\left(x+2\right)\left(x+3\right)}\)
6*h=h+h+h+h+h+h
2*d=d+d
Học tốt!!!
6*h=h+h+h+h+h+h
2*d=d+d
Chúc hok tốt và nhớ k đúng cho mình nha