namloveseen

2 năm trước

Giup mk với mn ơi : cho 245g dung dich h2so4 2% tac dung vua du voi 166,65 g dung dich bacl2 a, Viết pthh xảy ra b , Tính C% chất có trong dung dịch sau phản ứng?

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nguyentransondhy

2 năm trước

Đáp án:

C%HCl=0,9125%

Giải thích các bước giải:

Ta có: mH2So4=245.2%=4,9 gam -> nH2SO4=4,9/98=0,05 mol

H2SO4 + BaCl2 -> BaSO4 + 2HCl

Ta có: nBaCl2=nH2SO4=nBaSO4=0,05 mol -> mBaSO4=0,05.233=11,65 gam

Dung dịch sau phản ứng chứa HCl -> nHCl=2nH2So4=0,1 mol -> mHCl=0,1.36,5=3,65 gam

BTKL: m dung dịch sau phản ứng=m dung dịch H2So4 + mdung dịch BaCl2 -m BaSo4=245+166,65-11,65=400 gam

-> C% HCl=3,65/400=0,9125%

Nhật Dương

2 năm trước

Đáp án:

b) 0,9125%

Giải thích các bước giải:

H2SO4+BaCl2->BaSO4+2HCl

nH2SO4=245x2%/98=0,05(mol)

=>nHCl=0,05x2=0,1(mol)

mdd spu=245+166,65-0,05x233=400(g)

C%HCl=0,1x36,5/400x100%=0,9125%

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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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Giup mk với mn ơi : cho 245g dung dich h2so4 2% tac dung vua du voi 166,65 g dung dich bacl2 a, Viết pthh xảy ra b , Tính C% chất có trong dung dịch sau phản ứng?

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