-24/35.5/6<x<(-2)^2, với x là số nguyên
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\(-\frac{25}{35}\cdot\frac{5}{6}< x< (-2)^2\)
\(\Rightarrow-\frac{25}{7}\cdot\frac{1}{6}< x< 4\)
\(\Rightarrow-\frac{25}{42}< x< 4\)
Tự tìm x nhé :v nếu x không có thì ghi : x không thỏa mãn điều kiện
Đổi : \(40(ml)=0,04(l) , 200(ml)=0,2(l) \)
\(\Rightarrow n_{H_2SO_4} (bđ)=0,04.3=0,12(mol) \)
\(\Rightarrow CM_{H_2SO_4}=\dfrac{0,12}{0,2}=0,6(M)\)
\(33,5.3+33.5.x=335\)
\(33,5.\left(3+x\right)=335\)
\(3+x=10\)
\(x=7\)
a) 4.(13 - 16) - (3-5) .(-3)2
b) -2/5+ 7/11+ -11/10 + 7/-11
c) 1/2+2/3+1/6+-2/5
d) 34 .4-66/ 35.5+10.34
a) Ta có: \(4\cdot\left(13-16\right)-\left(3-5\right)\cdot\left(-3\right)^2\)
\(=4\cdot13-4\cdot16+2\cdot9\)
\(=52-64+18\)
=6
b) Ta có: \(-\dfrac{2}{5}+\dfrac{7}{11}+\dfrac{-11}{10}+\dfrac{7}{-11}\)
\(=-\left(\dfrac{2}{5}+\dfrac{11}{10}\right)+\left(\dfrac{7}{11}-\dfrac{7}{11}\right)\)
\(=-\left(\dfrac{4}{10}+\dfrac{11}{10}\right)\)
\(=\dfrac{-15}{10}=\dfrac{-3}{2}\)
\(PTK_X=102\left(đvC\right)\\ \Rightarrow M_X=102\left(\dfrac{g}{mol}\right)\)
\(\Rightarrow m_O=\%O.M_X=47,06\%.102=48\left(g\right)\)
\(\Rightarrow n_O=\dfrac{m}{M}=\dfrac{48}{16}=3\left(mol\right)\)
\(\Rightarrow CTHH.của.M.có.dạng:X_2O_3\)
\(\Leftrightarrow X.2+16.3=102\\ \Leftrightarrow X=27\left(đvC\right)\)
\(\Rightarrow X.là.Al\left(nhôm\right)\)
\(\Rightarrow CTHH.của.M:Al_2O_3\)
\(n_{Mg}=\dfrac{m_{Mg}}{M_{Mg}}=\dfrac{4.8}{24}=0,2mol\)
đổi 200 ml = 0,2 l
PTHH: Mg + 2HCl \(\rightarrow\) MgCl2 + H2
TL; 1 2 1 1
mol: 0,2 \(\rightarrow\) 0,2 \(\rightarrow\) 0,2
b. \(C_{M_{ddHCl}}=\dfrac{n_{HCl}}{V_{dd_{HCl}}}=\dfrac{0,2}{0,2}=1M\)
\(c.V_{H_2}=n_{H_2}.22,4=0,2.22,4=4,48l\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
a) PTHH : \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b) \(n_{HCl}=2n_{Mg}=0,4\left(mol\right)\Rightarrow C_{MddHCl}=\dfrac{0,4}{0,2}=2M\)
c) \(n_{Mg}=n_{H2}=0,2\left(mol\right)\Rightarrow V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
Name of school( tên trường của bạn) : VD: junior hight Song Da
Reasons you like it ( lí do bạn thích nó) : VD : Because my school organized a lot of activities appealing.
Reasons you don`t like it ( lí do trường bạn không thích) : VD: Because l have a lot of schools and students are busy taking beautiful car in the garage.
a. \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b. \(m_{HCl}=\dfrac{100\cdot9,6}{100}=9,6\left(g\right)\)
\(\Rightarrow n_{HCl}=\dfrac{9,6}{36,5}\approx0,3\left(mol\right)\)
Theo PTHH: \(n_{Mg}=\dfrac{1}{2}\cdot n_{HCl}=\dfrac{1}{2}\cdot0,3=0,15\left(mol\right)\)
\(\Rightarrow a=0,15\cdot24=3,6\left(g\right)\)
c.Theo PTHH: \(n_{H2}=\dfrac{1}{2}\cdot n_{HCl}=\dfrac{1}{2}\cdot0,3=0,15\left(mol\right)\)
\(\Rightarrow V_{H2}=0,15\cdot22,4=3,36\left(l\right)\)
a) PTHH: Mg + 2HCl ->MgCl2 + H2
b) nHCl= 100:36,5=2,74(mol)
pthh: Mg + 2HCl -> MgCl2 + H2
-> nMg= 2,74÷2×1=1,37(mol)
-> mMg=1,37×24=32,88(g)
-> a=32,88(g)
c) Theo ý a) -> nH2=2,74(mol)
->VH2=2,74×22,4=61,376(l)