7052cm khối =...đến khối
A:7,052
B:70,52
C:,705,2
D: 0,7052
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\(n_{CuCl_2}=2.0,2=0,4(mol)\\ n_{NaOH}=2.0,2=0,4(mol)\\ a,CuCl_2+2NaOH\to Cu(OH)_2+2NaCl\\ Cu(OH)_2\xrightarrow{t^o}CuO+H_2O\\ b,\dfrac{n_{CuCl_2}}{1}>\dfrac{n_{NaOH}}{2}\Rightarrow CuCl_2\text{ dư}\\ \Rightarrow n_{CuO}=0,2(mol)\\ \Rightarrow m_{CuO}=0,2.80=16(g)\\ c,n_{CuCl_2(dư)}=0,4-0,2=0,2(mol)\\n_{NaCl}=0,2(mol)\\ \Rightarrow m_{CuCl_2(dư)}=0,2.135=27(g)\\ m_{NaCl}=0,2.58,5=11,7(g)\)
Ta có :
\(\text{nFeCL3=0.12 nAl2(SO4)3=0.08 nH2SO4=0.2}\)
a. nNaOH=1.94
\(\text{2NaOH+H2SO4-->Na2SO4+2H2O}\)
0.4................0.2..........................................(mol)
\(\text{nNaOH còn=1.54}\)
\(\text{FeCL3+ 3NaOH-->Fe(OH)+3NaCl}\)
0.12...............0.36............0.12..........................(mol)
\(\text{nNaOH còn =1.18}\)
\(\text{ Al2(SO4)3+ 6NaOH-->2Al(OH3)+3Na2SO4}\)
0.08.....................0.48............0.16.................................(mol)
\(\text{-->nNaOH còn=0.7}\)
\(\text{Al(OH)3+ NaOH-->NaAlO2+2H2O}\)
0.16.................0.16............0.16.......................................(mol)
nNaOh còn =0.54
Nung B 2Fe(OH)3-->Fe2O3+3H2O
0.12 0.06
m=9.6
b.mdd H2SO4 ban đầu =1.14*200=228g
-->MddC=19.5+27.36+228-0.12*107=262.02
m nước cần thêm là 400-mddC=137.98
\(\left\{{}\begin{matrix}\text{c%NaOH dư=0.54*40/400=0.054%}\\\text{c%NaAlO2=0.16*82/400=0.0328%}\end{matrix}\right.\)
PTHH: \(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\downarrow\)
\(Cu\left(OH\right)_2\xrightarrow[]{t^o}CuO+H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{CuCl_2}=0,2\cdot2=0,4\left(mol\right)\\n_{NaOH}=0,2\cdot2=0,4\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,4}{1}>\dfrac{0,4}{2}\) \(\Rightarrow\) CuCl2 còn dư
\(\Rightarrow\left\{{}\begin{matrix}n_{NaCl}=0,4\left(mol\right)\\n_{Cu\left(OH\right)_2}=0,2\left(mol\right)=n_{CuO}=n_{CuCl_2\left(dư\right)}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CuO}=0,2\cdot80=16\left(g\right)\\C_{M_{NaCl}}=\dfrac{0,4}{0,2+0,2}=1\left(M\right)\\C_{M_{CuCl_2}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\\\end{matrix}\right.\)
a) khối thép thu nhiệt do tăng nhiệt độ
b) Nhiệt lương cần truyền cho khối thép
`Q = mc*(t_2-t_1) = 2*460*(250-20)=211600(J)`
a.\(M_A=23.2=46\) ( g/mol )
b.\(M_B=2,7.16=43,2\) ( g/mol )
c.\(M_C=2.29=58\) ( g/mol )
d.\(M_D=2.17=34\) ( g/mol )
e.\(M_E=1,32.44=58,08\) ( g/mol )
f.\(M_F=2,71.34=92,14\) ( g/mol )
g.\(M_G=1,5.32=48\) ( g/mol )
h.\(M_H=0,41.71=29,11\) ( g/mol )
B. 70,52