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Đặt \(n_{O_2}=x\left(mol\right)\)
\(2Cu\left(NO_3\right)_2\xrightarrow[]{t^o}2CuO+4NO_2\uparrow+O_2\\ \Rightarrow n_{NO_2}=4a\\ \Rightarrow22,4.\left(4a+a\right)=5,6\\ \Rightarrow a=0,05\left(mol\right)\\ \Rightarrow n_{Cu\left(NO_3\right)_2}=2a=0,1\left(mol\right)\\ \Rightarrow m_{Cu\left(NO_3\right)_2}=0,1.188=18,8\left(g\right)\)
a) \(n_{Cu\left(NO_3\right)_2}=\dfrac{282}{188}=1,5\left(mol\right)\)
=> \(n_{Cu\left(NO_3\right)_2\left(pư\right)}=\dfrac{1,5.90}{100}=1,35\left(mol\right)\)
PTHH: 2Cu(NO3)2 --to--> 2CuO + 4NO2 + O2
______1,35------------>1,35------------->0,675
=> mCuO = 1,35.80 = 108(g)
=> VO2 = 0,675.22,4 = 15,12 (l)
b) Gọi số mol Cu(NO3)2 cần nung là a (mol)
=> \(n_{Cu\left(NO_3\right)_2\left(pư\right)}=\dfrac{90a}{100}=0,9a\left(mol\right)\)
PTHH: 2Cu(NO3)2 --to--> 2CuO + 4NO2 + O2
______0,9a---------------------->1,8a--->0,45a
=> (1,8a+0,45a).22,4 = 5
=> a = 0,0992 (mol)
=> \(m_{Cu\left(NO_3\right)_2}=0,0992.188=18,6496\left(g\right)\)
\(n_{hh}=\dfrac{5.6}{22.4}=0.25\left(mol\right)\)
\(n_{Cu\left(NO_3\right)_2}=a\left(mol\right)\)
\(2Cu\left(NO_3\right)_2\underrightarrow{^{^{t^0}}}2CuO+4NO_2+O_2\)
\(a.........................2a...0.5a\)
\(n_{hh}=2a+0.5a=0.25\)
\(\Leftrightarrow a=0.1\)
\(m_{Cu\left(NO_3\right)_2}=0.1\cdot188=18.8\left(g\right)\)
Câu 2:
\(n_X=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)=>M_X=\dfrac{7}{0,25}=28\left(g/mol\right)\)
\(d_{X/H_2}=\dfrac{28}{2}=14\)
\(d_{X/CH_4}=\dfrac{28}{16}=1,75\)
\(d_{X/O_2}=\dfrac{28}{32}=0,875\)
X có thể là CO, C2H4, N2
Câu 3:
a) \(n_{Cu\left(NO_3\right)_2}=\dfrac{282}{188}=1,5\left(mol\right)\)
=> \(n_{Cu\left(NO_3\right)_2\left(pư\right)}=\dfrac{1,5.90}{100}=1,35\left(mol\right)\)
PTHH: 2Cu(NO3)2 --to--> 2CuO + 4NO2 + O2
_______1,35------------->1,35------------>0,675
=> mCuO = 1,35.80= 108(g)
=> VO2 = 0,675.22,4 = 15,12(l)
b) Gọi số mol Cu(NO3)2 cần nung là a
=> \(n_{Cu\left(NO_3\right)_2\left(pư\right)}=\dfrac{a.90}{100}=0,9a\left(mol\right)\)
PTHH: 2Cu(NO3)2 --to--> 2CuO + 4NO2 + O2
________0,9a-------------------->1,8a--->0,45a
=> Vkhí = (1,8a+0,45a).22,4 = 5
=> a = 0,0992 (mol)
=> mCu(NO3)2 = 0,0992.188 = 18,6496(g)
\(a,n_{CuO}=\dfrac{59}{80}=0,7375\left(mol\right)\\ PTHH:2Cu\left(NO_3\right)_2\rightarrow^{t^o}2CuO+4NO_2\uparrow+O_2\uparrow\\ \Rightarrow\left\{{}\begin{matrix}n_{O_2}=\dfrac{1}{2}n_{CuO}=0,36875\left(mol\right)\\n_{NO_2}=2n_{CuO}=1,475\left(mol\right)\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,36875\cdot22,4=8,26\left(l\right)\\V_{NO_2}=1,475\cdot22,4=33,04\left(l\right)\end{matrix}\right.\)
\(b,\text{Chất rắn thu đc là }CuO\text{ gồm có }Cu,O\\ \%_O=\dfrac{16}{80}\cdot100\%=20\%\\ \Rightarrow m_O=59\cdot20\%=11,8\left(g\right)\\ \Rightarrow m_{Cu}=59-11,8=47,2\left(g\right)\)
ủa anh minh lm r mà trong này nè
Tham khảo:
https://hoc24.vn/cau-hoi/nung-752-gam-cuno32-bi-phan-huy-theo-so-do-phan-ung-sau-cuno32-cuo-no2-o2-sau-mot-thoi-gian-thay-con-lai-59-gam-chat-ran-a-tinh-the-ti.3307073058847
\(n_{Cu\left(NO_3\right)_2}=\dfrac{75,2}{188}=0,4mol\)
Gọi \(n_{Cu\left(NO_3\right)_2pứ}=x\left(mol\right)\)
\(Cu\left(NO_3\right)_2\underrightarrow{t^o}CuO+2NO_2+O_2\)
\(m_{CuO}=80x\left(g\right)\)
\(m_{Cu\left(NO_3\right)_2pứ}=188\cdot\left(0,4-x\right)mol\)
\(\Rightarrow m_{CuO}+m_{Cu\left(NO_3\right)_2pứ}=59\)
\(\Rightarrow x=0,15mol\)
\(V_{NO_2}=2\cdot0,15\cdot22,4=6,72l\)
\(V_{O_2}=0,15\cdot22,4=3,36l\)
\(m_{CuO}=0,15\cdot80=12g\)
a, \(2Cu\left(NO_3\right)_2\underrightarrow{t^o}2CuO+4NO_2+O_2\)
b, \(n_{Cu\left(NO_3\right)_2}=\dfrac{28,2}{188}=0,15\left(mol\right)\)
Theo PT: \(\left\{{}\begin{matrix}n_{CuO}=n_{Cu\left(NO_3\right)_2}=0,15\left(mol\right)\\n_{O_2}=\dfrac{1}{2}n_{Cu\left(NO_3\right)_2}=0,075\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow m_{CuO}=0,15.80=12\left(g\right)\)
\(V_{O_2}=0,075.24,79=1,85925\left(l\right)\)
c, Ta có: \(n_{NO_2}+n_{O_2}=\dfrac{6,1975}{24,79}=0,25\left(mol\right)\)
Gọi: nO2 = x (mol)
Theo PT: \(n_{NO_2}=4n_{O_2}=4x\left(mol\right)\)
⇒ 4x + x = 0,25 ⇒ x = 0,05 (mol)
Theo PT: \(n_{Cu\left(NO_3\right)_2\left(LT\right)}=2n_{O_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Cu\left(NO_3\right)_2\left(LT\right)}=0,1.188=18,8\left(g\right)\)
Mà: H = 80% \(\Rightarrow m_{Cu\left(NO_3\right)_2\left(TT\right)}=\dfrac{18,8}{80\%}=23,5\left(g\right)\)
a. Ta có: nCuO=1,5.2:2=1,5 (mol)
mCuO=n.M=1,5.80=120 (g)
nO2=1,5.1:2=0,75 (mol)
VO2=n.22,4=0,75.22,4=16,8 (lit)
b.