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a)
nSO2=\(\frac{2,24}{22,4}\)=0,1(mol)
mSO2=0,1.64=6,4(g)
Số phân tử SO2=0,1.6.1023=6.1022( phân tử)
b)
nSO3=\(\frac{4}{80}\)=0,05(mol)
số phân tử SO3=0,05.6.1023=3.1022(phân tử)
VSO2=0,05.2,4=1,12(l)
c)
nCl2=3.1023/6.1023=0,5(mol)
VCl2=0,5.22,4=11,2(l)
mCl2=0,5.71=35,5 g
d)
nC2H4=\(\frac{3,36}{22,4}\)=0,15(mol)
Số phân tử=0,15.6.1023=9.1022
mC2H4=0,15.28=4,2 g
Bài 1:
a) \(n_{CO_2}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(n_{N_2}=\frac{44,8}{22,4}=2\left(mol\right)\)
b) \(n_{CO_2}=\frac{2,2}{44}=0,05\left(mol\right)\)
\(\Rightarrow V_{CO_2}=0,05\times22,4=1,12\left(l\right)\)
\(n_{O_2}=\frac{4,8}{32}=0,15\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,15\times22,4=3,36\left(l\right)\)
Bài 2:
\(n_{CO_2}=\frac{1,68}{22,4}=0,075\left(mol\right)\)
\(\Rightarrow m_{CO_2}=0,075\times44=3,3\left(g\right)\)
Bài 3:
\(n_{O_2}=\frac{0,001}{22,4}=\frac{1}{22400}\left(mol\right)\)
Số phân tử O2 là: \(\frac{1}{22400}\times6\times10^{23}=2,679\times10^{19}\) (phân tử)
\(m_{H_2O}=1\times1=1\left(g\right)\)
\(\Rightarrow n_{H_2O}=\frac{1}{18}\left(mol\right)\)
Số phân tử H2O là: \(\frac{1}{18}\times6\times10^{23}=3,333\times10^{22}\) (phân tử)
\(m_{Al}=1\times2,7=2,7\left(g\right)\)
\(\Rightarrow n_{Al}=\frac{2,7}{27}=0,1\left(mol\right)\)
Số nguyên tử Al là: \(0,1\times6\times10^{23}=0,6\times10^{23}\) (nguyên tử)
1a, \(n_{H_2O}=\dfrac{m}{M}=\dfrac{9}{2.1+16}=0,5\left(mol\right)\)
b,\(n_{Mg\left(NO_3\right)_2}=\dfrac{m}{M}=\dfrac{29,6}{24+2.14+2.3.16}=\dfrac{29,6}{148}=0,2\left(mol\right)\)
2, a, \(V_{SO_2}=n.22,4=0,4.22,4=8,96\left(l\right)\)
b,\(V_{CO_2}=n.22,4=4,4.22,4=98,56\left(l\right)\)
c, \(n_{O_2}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\)
\(V_{O_2}=0,25.22,4=5,6\left(l\right)\)
3, a, \(m_{Al_2O_3}=n.M=1,2.\left(2.27+3.16\right)=122.4\left(g\right)\)
b,\(n_{NO_2}=\dfrac{V}{22,4}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
\(m_{NO_2}=n.M=0,6.\left(14+2.16\right)=27,6\left(g\right)\)
4, \(n_A=\dfrac{V}{22,4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(M_A=\dfrac{m}{n}=\dfrac{4,25}{0,25}=17\left(g\text{/}mol\right)\)
a) mFeSO4= 0,25.152=38(g)
b) mFeSO4= \(\dfrac{13,2.10^{23}}{6.10^{23}}.152=334,4\left(g\right)\)
c) mNO2= \(\dfrac{8,96}{22,4}.46=18,4\left(g\right)\)
d) mA= 27.0,22+64.0,25=21,94(g)
e) mB= \(\dfrac{11,2}{22,4}.32+\dfrac{13,44}{22,4}.28=32,8\left(g\right)\)
g) mC= \(64.0,25+\dfrac{15.10^{23}}{6.10^{23}}.56=156\left(g\right)\)
h) mD= \(0,25.32+\dfrac{11,2}{22,4}.44+\dfrac{2,7.10^{23}}{6.10^{23}}.28=42,6\left(g\right)\)
hơi muộn nha<3
a) Ta có: \(n_{CO_2}=\frac{m_{CO_2}}{M_{CO_2}}=\frac{11}{44}=0,25\left(mol\right)\)
\(V_{CO_2}=n_{CO_2}.22,4=0,25.22,4=5,6\left(l\right)\)
b) Ta có: \(n_{Fe_2O_3}=\frac{m_{Fe_2O_3}}{M_{Fe_2O_3}}=\frac{80}{160}=0,5\left(mol\right)\)
a) nCO2 = mCO2 : MCO2 = 11 : 18 = 0,6 (mol)
=> VCO2 = nCO2 * 22,4 = 0,6 * 22,4 = 13,44 (lít)
b) nFe2O3 = mFe2O3 : MFe2O3 = 80 : 160 = 0,5 (mol)
- nCO2 = \(\frac{9.10^{23}}{6.10^{23}}=1,5\left(mol\right)\)
- mCO2 = 1,5 x 44 = 66 (gam)
- VCO2(đktc) = 1,5 x 22,4 = 33,6 lít
a) Khối lượng của 0,2 mol CO2 là:
m = 0,2 x 44 = 8,8 gam
b) nSO2 = 12,8 / 64 = 0,2 mol
=> VSO2(đktc) = 0,2 x 22,4 = 4,48 lít
c) nH2O = 36 / 18 = 2(mol)
=> Số phân tử H2O: \(2.6.10^{23}=12.10^{23}\)
a, \(m_{CO_2}=0,2.44=8,8\left(g\right)\)
b,\(n_{SO_2}=12,8:64=0,2\left(mol\right)\)
\(\Rightarrow V_{SO_2}=0,2.22,4=4,48\left(l\right)\)
c, \(n_{H_2O}=36:18=2\left(mol\right)\)
Số phân tử có trong 36 g \(H_2O\) là:
\(6,022.10^{23}.2=12,044.10^{23}\)
a) +m H2=12.2=24(g)
+n N2=\(\frac{3.10^{23}}{6.10^{23}}=0,5\left(mol\right)\)
m N2=0,5.28=14(g)
+n O2=1,12/22,4=0,05(mol)
m O2=0,05.32=1,6(g)
b) n H3PO4=19,6/98=0,2(mol)
n C6H12O6=90/180=0,5(mol)
a) nO2= \(\frac{3,36}{22,4}=0,15\left(mol\right)\)
=> mO2 = 0,15 . 324,8 (g)
b) nCO2 = \(\frac{4,4}{44}=0,1\left(mol\right)\)
VCO2= 0,1 . 22,4 = 2,24 (l)
c) nH2O =\(\frac{3\cdot10^{23}}{6,022\cdot10^{23}}\approx0,498\left(mol\right)\)