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a) C + O2 --to--> CO2
b) \(n_C=\dfrac{24}{12}=2\left(mol\right)\)
=> nCO2 =2 (mol)
=> mCO2 = 2.44 = 88(g)
c)
nO2 = 2(mol)
=> VO2 = 2.22,4 = 44,8 (l)
=> Vkk = 44,8.5=224(l)
\(n_{H_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
PT: \(2H_2+O_2\underrightarrow{t^o}2H_2O\)
Theo PT: \(n_{H_2O}=n_{H_2}=0,6\left(mol\right)\Rightarrow m_{H_2O}=0,6.18=10,8\left(g\right)\)
→ Đáp án: B
\(a,m_C=48\left(g\right)\rightarrow n_C=\dfrac{m_C}{M_C}=\dfrac{48}{12}=4\left(mol\right)\)
\(V_{O_2}=44,8\left(l\right)\rightarrow n_{O_2}=\dfrac{V_{O_2}}{22,4}=\dfrac{44,8}{22,4}=2\left(mol\right)\)
\(PTHH:C+O_2\underrightarrow{t^o}CO_2\)
\(pt:\) \(1mol\) \(1mol\)
\(đb:\) \(4mol\) \(2mol\)
Xét tỉ lệ:
\(\dfrac{n_{C\left(đb\right)}}{n_{C\left(pt\right)}}=\dfrac{4}{1}=4>\dfrac{n_{O_2\left(đb\right)}}{n_{O_2\left(pt\right)}}=\dfrac{2}{1}=2\)
\(\Rightarrow\) \(O_2\) hết, \(C\) dư.
\(b,PTHH:C+O_2\underrightarrow{t^o}CO_2\)
\(pt:\) \(1mol\) \(1mol\)
\(đb:\) \(2mol\) \(2mol\)
\(\Rightarrow m_{CO_2}=n_{CO_2}.M_{CO_2}=2.\left(1.C+2.O\right)=2.\left(1.12+2.16\right)=88\left(g\right)\)
\(a.n_C=\dfrac{48}{12}=4\left(mol\right);n_{O_2}=\dfrac{44,8}{22,4}=2\left(mol\right)\\ C+O_2\xrightarrow[t^0]{}CO_2\)
Theo pt:\(\dfrac{4}{1}>\dfrac{2}{1}\Rightarrow C\) dư, O2 pư hết
\(b.C+O_2\xrightarrow[t^0]{}CO_2\\ \Rightarrow n_{CO_2}=n_{O_2}=2mol\\ m_{CO_2}=2.44=88\left(g\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\
pthh:2Mg+O_2\underrightarrow{t^o}2MgO\)
0,2 0,1 0,2
\(V_{O_2}=0,1.22,4=2,24L\\
m_{MgO}=0,2.40=8g\)
\(n_C=\dfrac{3}{12}=0,25\left(mol\right)\)
\(pthh:C+O_2\underrightarrow{t^o}CO_2\)
\(LTL:0,25>0,1\)
=> C không cháy hết
a: \(C+O_2\rightarrow CO_2\)(ĐK: t độ)
b: \(n_C=n_{CO_2}=\dfrac{2.4}{12}=0.2\left(mol\right)\)
\(m_{CO_2}=0.2\cdot44=8.8\left(g\right)\)
c: \(n_{O_2}=0.2\left(mol\right)\)
\(\Leftrightarrow V_{O_2}=4.48\left(lít\right)\)
hay \(V_{KK}=22.4\left(lít\right)\)
\(n_{SO_2}=\dfrac{44,8}{22,4}=2\left(mol\right)=>m_{SO_2}=2.64=128\left(g\right)\)
\(n_{CO}=\dfrac{5,6}{22,4}=0,25\left(mol\right)=>m_{CO}=0,25.28=7\left(g\right)\)
=> mhh = 128 + 7 = 135 (g)
=> A
a) C + O2 --to--> CO2
b) \(n_C=\dfrac{6}{12}=0,5\left(mol\right)\)
PTHH: C + O2 --to--> CO2
0,5-->0,5------->0,5
=> mCO2 = 0,5.44 = 22 (g)
c) VO2 = 0,5.22,4 = 11,2 (l)
d) Vkk = 11,2.5 = 56 (l)
\(1,PTHH:CaCO_3\underrightarrow{t^o}CaO+CO_2\)
\(áp,dụng.dlbtkl,ta.có:\)
\(m_{CaCO_3}=m_{CaO}+m_{CO_2}\\ m_{CO_2}=m_{CaCO_3}-m_{CaO}=5-2,8=2,2\left(g\right)\)
\(2,a,pthh:4P+5O_2\underrightarrow{t^o}P_2O_5\)
\(n_P=\dfrac{m}{M}=\dfrac{12.4}{31}=0,4\left(mol\right)\)
\(b,theo.pthh\Rightarrow n_{O_2}=\dfrac{5}{4}n_P=\dfrac{5}{4}.0,4=0,5\left(mol\right)\\ \Rightarrow V_{O_2}=n.22,4=0,5.22,4=11,2\left(l\right)\\ m_{O_2}=n.M=0,5.32=16\left(g\right)\)
1. Áp dụng ĐLBTKL, ta có:
\(m_{CaCO_3}=m_{CaO}+m_{CO_2}\)
\(\Leftrightarrow5=2,8+m_{CO_2}\)
\(\Leftrightarrow m_{CO_2}=5-2,8=2,2\left(g\right)\)
2. Ta có: \(n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\)
a. \(PTHH:4P+5O_2\overset{t^o}{--->}2P_2O_5\)
b. Theo PT: \(n_{O_2}=\dfrac{5}{4}.n_P=\dfrac{5}{4}.0,4=0,5\left(mol\right)\)
Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}.n_P=\dfrac{1}{2}.0,4=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,5.22,4=11,2\left(lít\right)\\m_{P_2O_5}=0,2.142=28,4\left(g\right)\end{matrix}\right.\)
\(n_{CO_2}=\dfrac{44.8}{22.4}=2\left(mol\right)\)
\(C+O_2\underrightarrow{^{^{t^0}}}CO_2\)
\(2..............2\)
\(m_C=2\cdot12=24\left(g\right)\)
\(\Rightarrow A\)