Thương Bùi

2 năm trước

cho 3,2g CuO tác dụng vừa đủ với dung dịch H2SO4 4,9% a)Viết PTHH b) Tín nồng độ % của dung dịch CuSO4 -giúp mik giải câu b vs

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gainhangheo2506

2 năm trước

Đáp án:

7,69%

Giải thích các bước giải:

CuO + H2SO4 ---> CuSO4 + H2O

0,04 0,04 0,04

nCuO=3,2:80=0,04 (mol)

mH2SO4= 0,04.98=3,92 (g)

$mdd_{H2SO4}$ =$\frac{mH2SO4.100}{4,9}$=$\frac{3,92.100}{4,9}$ =80g

Ta có: mddCuSO4= mCuO + mddH2SO4 = 3,2 +80 =83,2 (g)

mCuSO4=0,04.160=6,4 (g)

C%= $\frac{6,4}{83,2}$ .100=7,69%

nguyentransondhy

2 năm trước

Đáp án:

b) C% CuSO4=7,69%

Giải thích các bước giải:

a) CuO + H2SO4 -> CuSO4 + H2O

Ta có: nCuO=3,2/(64+16)=0,04 mol=nH2SO4=nCuSO4

Ta có: mH2SO4=0,04.98=3,92 gam -> m dung dịch H2SO4=3,92/4,9%=80 gam

BTKL: m dung dịch sau phản ứng=mCuO + m dung dịch H2SO4=80+3,2=83,2 gam

mCuSO4=0,04.(64+96)=6,4 gam

-> C% CuSO4=6,4/83,2=7,69%

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cho 3,2g CuO tác dụng vừa đủ với dung dịch H2SO4 4,9% a)Viết PTHH b) Tín nồng độ % của dung dịch CuSO4 -giúp mik giải câu b vs

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cho 3,2g CuO tác dụng vừa đủ với dung dịch H2SO4 4,9% a)Viết PTHH b) Tín nồng độ % của dung dịch CuSO4 -giúp mik giải câu b vs

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Choose the best answer.I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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