Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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) Mg trong hợp chất Mg(NO3)2
Ta có: 1 . a = 2 . I
\(\Rightarrow a=\dfrac{2.I}{1}=II\)
Vậy: Mg hóa trị II
b) Cho \(m_{CO_2}\) = 8,8 g
\(\Rightarrow n_{CO_2}=\dfrac{m_{CO_2}}{M_{CO_2}}=\dfrac{8,8}{44}=0,2\)(mol)
Cho \(V_{N_2}=2240ml=2,24l\)
\(\Rightarrow n_{N_2}=\dfrac{V_{N_2}}{22,4}=\dfrac{2,24}{22,4}=0,1\)(mol)
c) Cho \(V_{CO_2}=4,48l\)
\(\Rightarrow n_{CO_2}=\dfrac{V_{CO_2}}{22,4}=\dfrac{4,48}{22,4}=0,2\)(mol)
\(\Rightarrow m_{CO_2}=n_{CO_2}.M_{CO_2}=0,2.44=8,8\)(g)
Còn câu d tính tiếp nha!
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)
\(n_{SO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
\(n_{O_2}=\dfrac{8}{32}=0,25\left(mol\right)\)
\(n_{CH_4}=\dfrac{6\times10^{22}}{6\times10^{23}}=0,1\left(mol\right)\)
\(\Rightarrow V_{hh}=\left(0,3+0,25+0,1+0,2\right)\times22,4=19,04\left(l\right)\)
\(m_{Cl_2}=0,2\times71=11,2\left(g\right)\)
\(m_{SO_2}=0,3\times64=19,2\left(g\right)\)
\(m_{CH_4}=0,1\times16=1,6\left(g\right)\)
\(\Rightarrow m_{hh}=11,2+8+19,2+1,6=40\left(g\right)\)
1) \(n_{Zn}=\frac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\)
\(m_{Zn}=0,25.65=16,25\left(g\right)\)
2) \(n_{NH_3}=\frac{3.10^{23}}{6.10^{23}}=0.5\left(mol\right)\)
\(m_{NH_3}=0,5.17=8,5\left(g\right)\)
3) \(m_{H2SO4}=0,45.98=44,2\left(g\right)\)
4) \(n_{NO2}=\frac{6,72}{22,4}=0,3\left(mol\right)\)
\(m_{NO2}=0,3.46=13,8\left(g\right)\)
5) \(n_{O_2}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
\(n_{H_2}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(m_{hh}=0,1.32+0,15.2=3,5\left(g\right)\)
6.10\(^{23}\) phân tử tức là 1 mol phân tử:
\(m_{FeS_2}=1.120=120\left(g\right)\)
\(m_{Fe_2O_3}=1.160=160\left(g\right)\)
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, \(n_A=\dfrac{V}{22,4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(M_A=\dfrac{m}{n}=\dfrac{4,25}{0,25}=17\left(g\text{/}mol\right)\)
nSO2 = 20,26 / 22,4 = 0,9 (mol)
nCO = \(\frac{7,2.10^{23}}{6.10^{23}}=1,2\left(mol\right)\)
=> Khối lượng hỗn hợp là:
mhỗn hợp = 5,6 + 0,9 x 64 + 1,2 x 28 + 0,5 x 32 = 112,8 (gam)
a,Đặt tạm Al2(SO4)3 là A nhé 
Có: nA=\(\frac{m_A}{M_A}\)=\(\frac{75,24}{27.2+\left(32+16.4\right).3}\)=0,22(mol)
b,Tương tự: nA=\(\frac{V_{A\left(Đktc\right)}}{22,4}\)=0.7(mol)
+ Số mol KMnO4: nKMnO4 = \(\frac{2,4.10^{23}}{6.10^{23}}=0,4\left(mol\right)\)
=> Khối lượng: mKMnO4 = 0,4 x 158 = 63,2 gam
+ Số mol Cu(OH)2: nCu(OH)2 = \(\frac{4,05.10^{23}}{6.10^{23}}=0,675\left(mol\right)\)
=> Khối lượng: mCu(OH)2 = 0,675 x 98 = 66,15 (gam)
+ Số mol NO: nNO = \(\frac{1,56.10^{23}}{6.10^{23}}=0,26\left(mol\right)\)
=> Thể tích NO: VNO(đktc) = 0,26 x 22,4 = 5,824 (lít)
=> mN=nN.14=0,3.14=4,2(g)
Nãy lỗi mạng quá
\(a.n_{N_2O}=\dfrac{8,8}{44}=0,2\left(mol\right)\\ \Rightarrow n_N=2n_{N_2O}=0,4\left(mol\right)\\ \Rightarrow m_N=0,4.14=5,6\left(g\right)\\ b.n_N=2n_{NH_4NO_3}=\dfrac{2.6.10^{23}}{6.10^{23}}=2\left(mol\right)\\ \Rightarrow m_N=2.14=28\left(g\right)\\ c.n_N=n_{NO}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ \Rightarrow m_N=0,3.14=4,2\left(g\right)\)