Фарғона туманидаги
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B.S-4
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Reaksiya unumi
1. KOH--->KHCO3---->K2CO3--->KCl reaksiya unumlari mos ravishda ketma-ketlikda 75%, 80%, 50% bo'lsa va KCl massasi reaksiya uchun olingan KOH massasidan 33,65 g ga kam bo'lsa nordon tuz massasini gr toping. A)75 B)120 C)80 D)100 Yechimi:
KCl(m) 74,5×0,5×0,8×0,75=22,35 g KOH Mr=56 g/mol 56-22,35=33,65 g ga kamaydi 33,65 g kam------100 g KHCO3 33,65 g kam-------x=100 g J: D
2. Bertole tuzini katalizator ishtirokida qizdirilganda hosil bo’lgan aralashmadagi xlorning massa ulushi 36% ni tashkil etsa, kaliy xloratning parchalanish darajasini (%) aniqlang.
3. NO2 ning parchalanish unumi (%) hosil bo'lgan gazlarning molyar massasiga teng bulsa, parchalanish unumini (%) hisoblang Yechimi:
2NO2-->2NO+O2 x. x. 0,5x x. 46 ---•100=-------------- 1. 1-x+1,5x x=0,385 Yana bir yechim: NO2=NO+0,5O2 x. x. 0,5x (30x+16x)+(46-46x). 46x•100 --------------------------------=------------ . (1-x)+x+0,5x. 46 x=0,385
J: 35,8%
4. 5 tonna CaCO3 dan 80% unum bilan X tonna pretsipitat olindi. Olingan o'g'it tarkibidagi ozuqa elementi miqdorini (t) toping. A) 3,55 B)4,26 C)3,9 D)2,84 Yechimi:
100g------------------1 mol CaHPO4 5 000 kg-----------------x=50 kg/mol 2CaHPO4=P2O5 2 mol---------------142 g 50 kg/mol-------x=3,55 tonna 3,55×0,8=2,84 tonna J: D 5. Is gazi va suv bug’i orasidagi qaytar reaksiya temir (III)-oksid katalizatori ishtirokida boradi. Dastlabki aralashmaning mol nisbati mos ravishda 1:1 bo’lganda reaksiyaning unumi y ga teng, 2:1 bo’lganda esa 25 % ga ortadi. y ni toping? A) 0,4 B) 0,65 C) 0,7 D) 0,8 Bio-Cemistry, [03.01.18 15:57] [Forwarded from Asqarjon Otaqulov] Y^2 (1.25y)^2 ----------=--------------------=> (1-y)(1-y) (2-1.25y)(1-1.25y) Y^2 1.5625y^2 ----------=------------------------------ 1-2y+y^2 2-3.75y+1.5625y^2 1.5625y^2-3.125y^3+1.5625y^4= 2y^2-3.75y^3+1.5625y^4 0.625y^3=0.4375y^2 0.625y=0.4375 Y=0.7 6.
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