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1mol H2SO4 có 6,022.1023 phân tử H2SO4
=> 7,3.1023 phân tử H2SO4 có số mol = \(\dfrac{7,3.10^{23}}{6,022.10^{23}}\)= 1,21 mol
<=> Khối lượng của 7,3.1023 phân tử H2SO4 = 1,21.98 = 118,58 gam
b) 8,8 gam CO2 có số mol = \(\dfrac{8,8}{44}\)=0,2 mol
=> V CO2 =0,2.22,4 = 4,48 lít
c) 6,72 lít O2 có số mol = 0,3 mol
Tương tự ta có 1 mol O2 thì có 6,022.1023 phân tử O2
=> 0,3 mol O2 thì có 0,3.6,022.123 = 1,806.1023 phân tử O2
a.
\(m_{Al}=0.5\cdot27=13.5\left(g\right)\)
\(m_{CO_2}=\dfrac{6.72}{22.4}\cdot44=13.2\left(g\right)\)
\(m_{N_2}=\dfrac{5.6}{22.4}\cdot28=7\left(g\right)\)
\(m_{CaCO_3}=0.25\cdot100=25\left(g\right)\)
b.
\(m_{hh}=\dfrac{3.36}{22.4}\cdot2+\dfrac{5.6}{22.4}\cdot28+0.2\cdot44=16.1\left(g\right)\)
a) \(n_{C_{12}H_{22}O_{11}}=\dfrac{25,65}{364}=0,07\left(mol\right)\)
b) \(n_{Cl_2}=\dfrac{1,2.10^{23}}{6.10^{23}}=0,2\left(mol\right)\)
\(m_{Cl_2}=0,2.71=14,2\left(g\right)\)
c) \(n_{C_2H_2}=\dfrac{52}{26}=2\left(mol\right)\)
\(m_{C_2H_2}=2.22,4=44,8\left(l\right)\)
d) \(n_{O_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
Số phân tử của O2 là 0,25.6.1023 = 1,5.1023
Câu 1 :
a)
nCO2 = 13.2/44 = 0.3(mol)
VCO2 = 0.3*22.4 = 6.72 (l)
b)
nC4H10 = 8.96/22.4 = 0.4 (mol)
mC4H10 = 0.4*58 = 23.2 (g)
c)
nCaO = 3*10^23 / 6 *10^23 = 0.5 (mol)
nCa(OH)2 = 1.8*10^23 / 6*10^23 = 0.3 (mol)
mA = 0.5*56 + 0.3*74 = 50.2 (g)
Câu 1::
a) nCO2=13,2/44=0,3(mol)
=>V(CO2,đktc)=0,3.22,4=6,72(l)
b) nC4H10=8,96/22,4=0,4(mol)
->mC4H10=0,4.58= 23,2(g)
c) nCaO= (3.1023)/(6.1023)= 0,5(mol)
nCa(OH)2= (1,8.1023)/(6.1023)=0,3(mol)
=>mhhA= mCaO+ mCa(OH)2= 0,5.56 + 0,3.74= 50,2(g)
a)
- \(V_{CO}=n.24=0,2.24=4,8\left(l\right)\)
- \(n_{SO_3}=\dfrac{m}{M}=\dfrac{8}{80}=0,1\left(mol\right)\)
`=>` \(V_{SO_3}=n.24=0,1.24=2,4\left(l\right)\)
- \(n_{N_2}=\dfrac{\text{Số phân tử}}{6.10^{23}}=\dfrac{3.10^{23}}{6.10^{23}}=0,5\left(mol\right)\)
`=>` \(V_{N_2}=n.24=0,5.24=12\left(l\right)\)
b)
- \(m_{Fe_2O_3}=n.M=0,25.160=40\left(g\right)\)
- \(m_{Al_2O_3}=n.M=0,15.102=15,3\left(g\right)\)
- \(n_{O_2}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
`=>` \(m_{O_2}=n.M=0,15.32=4,8\left(g\right)\)
c)
Ta có: \(\left\{{}\begin{matrix}n_{SO_2}=\dfrac{m}{M}=\dfrac{8}{64}=0,125\left(mol\right)\\n_{CO_2}=\dfrac{m}{M}=\dfrac{4,4}{44}=0,1\left(mol\right)\\n_{H_2}=\dfrac{m}{M}=\dfrac{0,1}{2}=0,05\left(mol\right)\end{matrix}\right.\)
`=>` \(n_{hh}=n_{SO_2}+n_{CO_2}+n_{H_2}=0,125+0,1+0,05=0,275\left(mol\right)\)
`=>` \(V_{hh\left(\text{đ}ktc\right)}=n_{hh}.22,4=0,275.22,4=6,16\left(l\right)\)
a)
\(n_{H_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ m_{H_2}=n\cdot M=0,25\cdot2=0,5\left(g\right)\)
b)
\(n_{O_2}=\dfrac{3\cdot10^{23}}{6\cdot10^{23}}=0,5\left(mol\right)\\ m_{O_2}=n\cdot M=0,5\cdot32=16\left(g\right)\)
a, \(n=\dfrac{V}{22,4}\left(đktc\right)=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(M=2.H=2.1=2\)(g/mol)
\(m=n.M=0,25.2=0,5\left(g\right)\)
b, \(n=\dfrac{3.10^{23}}{6.10^2}=0,5\left(mol\right)\)
\(V=n.22,4\left(đktc\right)=0,5.22,4=11,2\left(l\right)\)