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Phạm Quốc Dũng
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Nguyễn Hoàng Nam
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Ngô Quang Sinh
8 tháng 6 2018 lúc 2:28

Đáp án A

Dương Thành
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Nguyễn Đức Phúc
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๖ۣۜDũ๖ۣۜN๖ۣۜG
8 tháng 5 2022 lúc 14:43

\(m_{H_2SO_4}=\dfrac{100.96,48}{100}=96,48\left(g\right)\)

\(m_{dd.sau.thí.nghiệm}=\dfrac{96,48.100}{90}=107,2\left(g\right)\)

=> \(m_{H_2O\left(thêm\right)}=107,2-100=7,2\left(g\right)\Rightarrow n_{H_2O}=\dfrac{7,2}{18}=0,4\left(mol\right)\)

=> nO(mất đi) = 0,4 (mol)

Có: mX = mY + mO(mất đi) = 113,6 + 0,4.16 = 120 (g)

Nguyễn Hoàng Nam
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Ngô Quang Sinh
16 tháng 4 2017 lúc 9:44

A

Ta có nO = nCaCO3  = 1,5.10-3.

Vy m = 2,15 + 16. 1,5.10-3 = 2,174 gam

Hữu Tám
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D-low_Beatbox
18 tháng 3 2021 lúc 20:53

Theo định luật bảo toàn khối lượng, ta có:

      mX + mCO =  mY + mCO2

      ⇒ m – n  =  mCO2 – mCO

⇒ m – n  = 44.nCO2 – 28.nCO

 nCO = nCO2  = nCaCO3 = p/100

⇒ m – n   =\(\dfrac{\text{(44−28)p}}{100}\)=16p/100

⇒ m = n  + 0,16p

Các PTPƯ xảy ra:

 3Fe2O3 + CO \(\text{→}^{t^o}\) 2Fe3O+ CO2

 Fe2O3 + CO \(\text{→}^{t^o}\) 2FeO + CO2

 Fe2O3 + 2CO \(\text{→}^{t^o}\) 2Fe + 3CO2

 CuO + CO \(\text{→}^{t^o}\) Cu + CO2

 Ca(OH)2 + CO2 → CaCO3 + H2O

Hữu Tám
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hnamyuh
18 tháng 3 2021 lúc 21:01

\(m_{O\ pư} = m_X - m_Y = m - n(gam)\\ n_O = \dfrac{m-n}{16}(mol)\\ CO + O_{oxit} \to CO_2\\ n_{CO_2} = n_O = \dfrac{m-n}{16}(mol)\\ CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\\ n_{CaCO_3} = n_{CO_2} = \dfrac{m-n}{16}(mol)\\ \Rightarrow \dfrac{m-n}{16}.100 = p\\ \Leftrightarrow 100m -100n - 16p = 0\)

Hoàng Linh
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Do Minh Tam
14 tháng 6 2016 lúc 17:37

nCO2 =nCa(OH)2=6/100=0,06 mol=nCO pứ
nFe2O3=16/160=0,1 mol
=>nFe=0,2 mol
bảo toàn Fe nFe hh sau pứ=0,2 mol
bảo toàn klg=> m cr sau pứ=16+0,06.28-0,06.44=15,04 gam
GS hh cr sau pứ gồm Fe và O
=>mO=15,04-0,2.56=3,84 gam
=>nO=0,24 mol
khi cho hh cr tác dụng với H2SO4 đặc nóng
O          +2e     => O−2
0,24 mol=>0,48 mol
S+6 +2e     => S+4
          0,12 mol=>0,06 mol
Fe             => Fe+3 +3e
0,2 mol                      =>0,6 mol
VSO2=0,06.22,4=1,344 lit

c giải cho e r mà?

Do Minh Tam
14 tháng 6 2016 lúc 17:47

nCO2=nCa(OH)2=6/100=0,06 mol=nCO

nFe2O3=16/160=0,1 mol
=>nFe=0,2 mol
bảo toàn ngtố Fe nFe hh sau pứ=0,2 mol
bảo toàn klg=> m cr sau pứ=16+0,06.28-0,06.44=15,04 gam
GS hh cr sau pứ gồm Fe và O
=>mO=15,04-0,2.56=3,84 gam
=>nO=0,24 mol
khi cho hh cr tác dụng với H2SO4 đặc nóng
O              +2e     => O-20,24 mol=>0,48 mol
S+6 +2e     => S+4
          0,12 mol=>0,06 mol
Fe             => Fe+3    +3e
0,2 mol                      =>0,6 mol
VSO2=0,06.22,4=1,344 lit
(lỗi kí tự hóa học)
bảo nam trần
14 tháng 6 2016 lúc 17:56

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Nguyễn Hoàng Nam
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Ngô Quang Sinh
3 tháng 3 2017 lúc 15:23