ππ‘ππ¦ππππ’ππ
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1οΈβ£9οΈβ£ 43-topshiriq shundaymidi? β kirib chiqqanlar
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π2
36. Mn3O4+KMnO4+H2SO4= tenglashtiring.....
π5MnβOβ + 2KMnOβ + 24HβSOβ = 17MnSOβ + KβSOβ + 24HβO
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1οΈβ£9οΈβ£ 43-topshiriq shundaymidi? β tuzatilgan variantiβ
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π3
2οΈβ£0οΈβ£ 89,2 g xlorofill yondirilganda gazlangan suvlar tarkibida uchraydigan 242 g gaz, 64,8 g suv, 5,6 g azot va 4 g magniy oksid hosil boβldi. Xlorofill formulasini aniqlang.
A) C55H72N4O5Mg
B) C55H72N4O6Mg
C) C54H72N4O5Mg
D) C55H70N4O5Mg
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β€1
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π₯3β€2π1
1οΈβ£ 200 g 34% li AgNOβ eritmasiga 10 g mis plastinka tushirildi. Birmuncha vaqt oβtgach, plastinka eritmadan chiqarib olindi va hosil boβlgan eritma toβliq elektroliz qilindi. Elektroliz jarayoni yakunlangach, katodda 28 g massali metallar aralashmasi hosil boβldi.
33. Elektroliz jarayonida ajralgan kislorod massasini (g) aniqlang.
34. Eritmadan chiqarib olingan plastinkada qolgan mis massasini (g) aniqlang.
35. Plastinkaga ajralib chiqqan kumush massasini (g) aniqlang.
Javob: 33) 3,2; 34) 3,6 g; 35) 21,6 g
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ππ‘ππ¦ππππ’ππ
3οΈβ£3οΈβ£
200*0,34/170=0,4 e*mol
m=0,4*8=3,2g
3οΈβ£4οΈβ£
(0,4-x)*108+32x=28 x=0,2 e*mol
m=10-(0,2*32)=3,6g
3οΈβ£5οΈβ£
m=(0,4-0,2)*108=21,6g
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ustoz
kanal
kanal
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2οΈβ£ KBr va kaliy galogeniddan iborat aralashma teng ikki qismga bir qismga Fe(NO3)2 qo'shiladi va bir qismga AgNO3 qoshildi va teng massali cho'kmalar hosil boldi, dastlabki aralashmani mol nisbati topilsin.
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β€1
3οΈβ£ Qaysi moddada H ning massa ulushi eng kichik
-Li2HPO4
-CaOHNO3
-KHCO3
-CsH
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