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a) \(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\)
\(n_{CaCO_3}=\dfrac{25}{100}=0,25\left(mol\right)\)
\(n_{NaOH}=\dfrac{4}{40}=0,1\left(mol\right)\)
\(n_{...}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\)
b)
\(m_{ZnSO_4}=0,25.161=40,25\left(g\right)\)
\(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
\(m_{Cu}=0,3.64=19,2\left(g\right)\)
\(m_{Fe_2\left(SO_4\right)_3}=0,35.400=140\left(g\right)\)
d) \(V_{CO_2}=0,2.22,4=4,48\left(l\right)\)
\(V_{Cl_2}=0,15.22,4=3,36\left(l\right)\)
\(V_{SO_2}=0,3.22,4=6,72\left(l\right)\)
a. \(m_{CO_2}=\dfrac{8,96}{22,4}.44=17,6\left(g\right)\)
b. \(m_{Fe}=\dfrac{1,8.10^{22}}{6.10^{23}}.56=1,68\left(g\right)\)
c. \(m_{Fe_2\left(SO_4\right)_3}=0,25.400=100\left(g\right)\)
Bài làm
* \(m_{ZnSO4}=n.M=0,25.\left(65+32+16.4\right)=0,25.161=40,25\left(g\right)\)
* \(m_{AlCl3}=n.M=0,2.\left(27+35,5.3\right)=0,2.133,5=26,7\left(g\right)\)
* \(m_{Cu}=n.M=0,3.64=19,2\left(g\right)\)
* \(m_{Ca\left(OH\right)2}=n.M=0,15.\left[40+\left(16+1\right).2\right]=0,15.74=11,1\left(g\right)\)
* \(m_{Fe2\left(SO4\right)3}=n.M=0,35.\left[56+\left(32+16.4\right).3\right]=0,35.344=120,4\left(g\right)\)
# Học tốt #
a) Giả sử có 100 gam hỗn hợp
=> \(m_S=\dfrac{100.22,61}{100}=22,61\left(g\right)\)
=> \(n_S=\dfrac{22,61}{32}=\dfrac{2261}{3200}\left(mol\right)\)
Mà nO = 4nS
=> \(n_O=\dfrac{2261}{800}\left(mol\right)\)
\(\%m_O=\dfrac{\dfrac{2261}{800}.16}{100}.100\%=45,22\%\)
b)
\(n_{Fe}=\dfrac{18.10^{24}}{6.10^{23}}=30\left(mol\right)\)
=> \(n_{Fe_2\left(SO_4\right)_3}=15\left(mol\right)\)
Gọi số mol CuSO4 là x (mol)
=> mhh = 160x + 6000 (g)
nS = 15.3 + x = x + 45 (mol)
\(\%m_S=\dfrac{\left(x+45\right).32}{160x+6000}.100\%=22,61\%\)
=> x = 20 (mol)
mhh = 160.20 + 6000 = 9200 (g)
Bài 1 :
Số mol , khối lượng , số phân tử của các chất lần lượt là :
\(a.\)\(\)
\(n_{O_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)
\(m_{O_2}=0.05\cdot32=1.6\left(g\right)\)
\(0.05\cdot6\cdot10^{23}=0.3\cdot10^{23}\left(pt\right)\)
\(b.\)
\(n_{SO_3}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(m_{SO_3}=0.1\cdot80=8\left(g\right)\)
\(0.1\cdot6\cdot10^{23}=0.6\cdot10^{23}\left(pt\right)\)
\(c.\)
\(n_{H_2S}=\dfrac{36}{22.4}=\dfrac{45}{28}\left(mol\right)\)
\(m_{H_2S}=\dfrac{45}{28}\cdot34=\dfrac{765}{14}\left(g\right)\)
\(\dfrac{45}{28}\cdot6\cdot10^{23}=\dfrac{135}{14}\cdot10^{23}\left(pt\right)\)
\(d.\)
\(n_{C_4H_{10}}=\dfrac{4.48}{22.4}=0.2\left(mol\right)\)
\(m_{C_4H_{10}}=0.2\cdot58=11.6\left(g\right)\)
\(0.2\cdot6\cdot10^{23}=1.2\cdot10^{23}\left(pt\right)\)
Bài 2 :
\(a.\)
\(n_{SO_3}=\dfrac{16}{80}=0.2\left(mol\right)\)
Số phân tử SO3 : \(0.2\cdot6\cdot10^{23}=1.2\cdot10^{23}\left(pt\right)\)
\(b.\)
\(n_{NaOH}=\dfrac{8}{40}=0.2\left(mol\right)\)
Số phân tử NaOH : \(0.2\cdot6\cdot10^{23}=1.2\cdot10^{23}\left(pt\right)\)
\(c.\)
\(n_{Fe_2\left(SO_4\right)_3}=\dfrac{16}{400}=0.04\left(mol\right)\)
Số phân tử Fe2(SO4)3 : \(0.04\cdot6\cdot10^{23}=0.24\cdot10^{23}\left(pt\right)\)
\(d.\)
\(n_{Al_2\left(SO_4\right)_3}=\dfrac{34.2}{342}=0.1\left(mol\right)\)
Số phân tử Al2(SO4)3 : \(0.1\cdot6\cdot10^{23}=0.6\cdot10^{23}\left(pt\right)\)
\(m_{Fe_2\left(SO_4\right)_3}=0.25.400=100\left(g\right)\)
m Fe2(SO4)3 = n . M = 0.25 . (56.2 + (32 + 16.4).3) = 100 (g)