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\(a,n_{CuO}=\dfrac{59}{80}=0,7375\left(mol\right)\\ PTHH:2Cu\left(NO_3\right)_2\rightarrow^{t^o}2CuO+4NO_2\uparrow+O_2\uparrow\\ \Rightarrow\left\{{}\begin{matrix}n_{O_2}=\dfrac{1}{2}n_{CuO}=0,36875\left(mol\right)\\n_{NO_2}=2n_{CuO}=1,475\left(mol\right)\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,36875\cdot22,4=8,26\left(l\right)\\V_{NO_2}=1,475\cdot22,4=33,04\left(l\right)\end{matrix}\right.\)
\(b,\text{Chất rắn thu đc là }CuO\text{ gồm có }Cu,O\\ \%_O=\dfrac{16}{80}\cdot100\%=20\%\\ \Rightarrow m_O=59\cdot20\%=11,8\left(g\right)\\ \Rightarrow m_{Cu}=59-11,8=47,2\left(g\right)\)
\(1)PTHH:CaCO_3\xrightarrow{t^o}CaO+CO_2\uparrow\\ n_{CaCO_3}=\dfrac{500.95\%}{100}=4,75(mol)\\ \Rightarrow n_{CaO}=4,75(mol)\\ \Rightarrow m_{CaO}=4,75.56=266(g)\\ \Rightarrow m_{CaO(tt)}=266.80\%=212,8(g)\\ m_{CaCO_3(k p/ứ)}=500.95\%.20\%=95(g)\\ \Rightarrow m_A=95+212,8=307,8(g)\\ 2)\%m_{CaO}=\dfrac{212,8}{307,8}.100\%=69,136\%\\ n_{CO_2}=n_{CaO}=4,75(mol)\\ \Rightarrow V_{CO_2}=4,75.22,4=106,4(l)\)
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 \(n_{Cu\left(NO_3\right)_2pứ}=x\left(mol\right)\)
\(Cu\left(NO_3\right)_2\underrightarrow{t^o}CuO+2NO_2+O_2\)
\(m_{CuO}=80x\left(g\right)\)
\(m_{Cu\left(NO_3\right)_2pứ}=188\cdot\left(0,4-x\right)mol\)
\(\Rightarrow m_{CuO}+m_{Cu\left(NO_3\right)_2pứ}=59\)
\(\Rightarrow x=0,15mol\)
\(V_{NO_2}=2\cdot0,15\cdot22,4=6,72l\)
\(V_{O_2}=0,15\cdot22,4=3,36l\)
\(m_{CuO}=0,15\cdot80=12g\)
Giả sử có 100g đá
=> \(m_{CaCO_3}=\dfrac{100.80}{100}=80\left(g\right)\)
\(n_{CaCO_3}=\dfrac{80}{100}=0,8\left(mol\right)\)
Gọi số mol CaCO3 phân hủy
PTHH: CaCO3 --to--> CaO + CO2
a-------------->a--->a
=> mY = 100 - 44a (g)
=> mCaO = 56a (g)
=> \(\dfrac{56a}{100-44a}.100\%=45,65\%\)
=> a = 0,6 (mol)
=> \(H=\dfrac{0,6}{0,8}.100\%=75\%\)
Câu 7:
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\\ n_{H_2SO_4}=\dfrac{39,2}{98}=0,4\left(mol\right)\\ Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ Vì:\dfrac{0,4}{1}>\dfrac{0,3}{1}\Rightarrow H_2SO_4dư,Znhết\\ a,n_{H_2}=n_{Zn}=0,3\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ b,n_{O\left(mất\right)}=n_{H_2O}=n_{H_2}=0,3\left(mol\right)\\ \Rightarrow m_{giảm}=m_{O\left(mất\right)}=0,3.16=4,8\left(g\right)\\ \Rightarrow m=4,8\left(g\right)\)
Câu 6:
- Giả sử có 1 mol hỗn hợp khí A.
\(\Rightarrow\left\{{}\begin{matrix}n_{N_xO}=30\%.1=0,3\left(mol\right)\\n_{SO_2}=30\%.1=0,3\left(mol\right)\\n_{CO_2}=1-\left(0,3+0,3\right)=0,4\left(mol\right)\end{matrix}\right.\\ \Rightarrow m_A=0,3.\left(14x+16\right)+0,3.64+0,4.44=41,6+4,2x\left(g\right)\\ \%m_{N_xO}=19,651\%\\ \Leftrightarrow\dfrac{4,2x+4,8}{41,6+4,2x}.100\%=19,651\%\\ \Leftrightarrow x=1\\ \Rightarrow N_xO.là:NO\\ M_{hhA}=\dfrac{0,3.30+0,3.64+0,4.44}{1}=45,8\left(\dfrac{g}{mol}\right)\\ \Rightarrow d_{\dfrac{hhA}{H_2}}=\dfrac{45,8}{2}=22,9\)
$2KMnO_4\xrightarrow{t^o}K_2MnO_4+MnO_2+O_2$
$a\bigg)$
$n_{KMnO_4}=\frac{15,8}{158}=0,1(mol)$
Chất rắn sau p/ứ là $K_2MnO_4,MnO_2$
Theo PT: $n_{K_2MnO_4}=n_{MnO_2}=0,05(mol)$
$\to m_{\rm chất\, rắn}=0,05.197+0,05.87=14,2(g)$
$b\bigg)$
Vì $H=80\%\to n_{KMnO_4(p/ứ)}=0,1.80\%=0,08(mol)$
$\to n_{KMnO_4(dư)}=0,02(mol)$
Chất rắn sau p/ứ là $KMnO_4(dư):0,02;K_2MnO_4:0,04;MnO_2:0,04$
$\to m_{\rm chất\, rắn}=0,02.158+0,04.197+0,04.87=14,52(g)$
$c\bigg)$
Bảo toàn KL có:
$m_{O_2}=m_{KMnO_4}-m_{CR}$
$\to m_{O_2}=15,8-14,68=1,12(g)\to n_{O_2}=0,035(mol)$
Theo PT: $n_{KMnO_4(p/ứ)}=2n_{O_2}=0,07(mol)$
$\to H=\dfrac{0,07}{0,1}.100\%=70\%$
\(m_{CaCO_3}=90\%.400=360\left(g\right)\\ \rightarrow n_{CaCO_3}=\dfrac{360}{100}=3,6\left(mol\right)\)
PTHH: CaCO3 --to--> CaO + CO2
3,6 ----------> 3,6 -----> 3,6
\(\rightarrow n_{CaO}=3,6.75\%=2,7\left(mol\right)\\ \rightarrow n_{CaCO_3\left(chưa.pư\right)}=3,6-2,7=0,9\left(mol\right)\)
\(\rightarrow m_X=0,9.100+2,7.56=241,2\left(g\right)\\ \%m_{CaO}=\dfrac{0,9.100}{241,2}=37,31\%\)
\(V_Y=V_{CO_2}=3,6.75\%.22,4=60,48\left(l\right)\)
\(m_{CaCO_3}=\dfrac{400\cdot90\%}{100\%}=360g\Rightarrow n_{CaCO_3}=\dfrac{360}{100}=3,6mol\)
\(CaCO_3\underrightarrow{t^o}CaO+CO_2\)
3,6 3,6 3,6
Thực tế: \(n_{CaO}=3,6\cdot75\%=2,7mol\)
\(\Rightarrow m_{CaO}=2,7\cdot56=151,2g\)
a)mCaCO3=500.80%=400(g) -> nCaCO3=400/100=4(mol)
PTHH: CaCO3 -to-> CaO + H2O
nCaO(LT)=nCaCO3=4(mol)
=> nCaO(TT)=4. 70%=2,8(mol)
=>mX=mCaO+ m(trơ)+ mCaCO3(chưa p.ứ)=2,8.56+100+ 1,2.100=376,8(g)
b) %mCaO= (156,8/376,8).100=41,614%
