Misol: 10 g suvda 2,24 g ammiak eritilgan. Bu eritmadagi ammiakning massa ulushi nimaga tenga 15 b 18 c 20 d 22 yechim

8-tur masalalar
Yechim:C%=10x18(H2O)/142+180=56%
. Tarkibi Na₂SO₄*10H₂O bo’lgan glauber tuzidagi suvning massa ulushi (%) qanchaga teng? a) 54 b) 58 c) 56 d) 57 e) 55
17. Alebaster tarkibidagi kalsiyning massa ulushi to’g’ri ko’rsatilgan javobni tanlang. a) 27,6 b) 26,0 c) 29,4 d) 23,3 e) 24,8
18. 200 g 10% li natriy karbanat eritmasini tayyorlash uchun necha gr kristall soda Na₂CO₃*10H₂O olish kerak? a) 34 b) 44 c) 54 d) 64 e) 74
19. Massa ulushi 3% bo’lgan Na₂CO₃ ning 50 g eritmasini tayyorlash uchun necha gr kristallik soda olish kerak?
a) 3,70 b) 4,70 c) 4,50 d) 4,05 e) 3,45
20. 100 g 2% li mis (II) sulfat eritmasini tayyorlash uchun kerak bo’lgan mis kuporosi (CuSO₄*5H₂O) va suvning massasini toping.a) 3,13 va 96,87 b) 13,8 va 86,2 c) 14,5 va 85,5 d) 20,2 va 79,8 e) 23,4 va 76,6
21. 150g 5% li mis (II) sulfat eritmasini tayyorlash uchun kerak bo’lgan mis kuporosi (CuSO₄*5H₂O) va suvning massasini toping. a) 10 va 140 b) 13 va 137 c) 12 va 138 d) 14 va 136 e)15 va 135
22. Zichligi 1.07g/ml bo’lgan 100 ml 8% li natriy sulfat eritmasiga qanday massadagi Na₂SO₄*10H₂O Kristallgidratidan qo’shganimizda, tuzning eritmadagi massa ulushi ikki marta ortadi?
A) 40.5 B) 50.6 C) 30.5 D) 45 E) 50
23. Zichligi 1,17 g ml bo’lgan 16% li 200 ml natriy korbanat eritmasi konsentrasiyasini 20% ga yetkazish uchun shu eritmaga necha gr Na₂CO₃*10H₂O qo’shish kerak?
a) 45,64 b) 54,85 c) 65,62 d) 70,05 e) 54,95
24. Kobalt (II) xloridning massa ulushi 15% bo’lgan eritmasini tayyorlash uchun 476 g CoCI₂*6H₂O kristallgidrat necha gr suvda eritilishi kerak?
a) 628 b) 958 c) 727 d) 1257 e) 1558
25. Temir (II) sulfat tuzining 10% li eritmasini tayyorlash uchun 30 gr FeSO₄*7H₂O tuziga necha millilitr suv qo’shish kerak?
a) 141,2 b) 131,2 c) 133,2 d) 129.3 e) 134.0
26. Ruh sulfatning 8% li eritmasini tayyorlash uchun 57,4g ZnSO₄*7H₂O ga necha gramm suv qo’shish kerak? A) 345 B) 218 C) 366 D) 380 E) 400
27. 47,6 g CoCI₂ *6H₂O kristallgidrat suvda eritilib, kobalt (II) xloridning 13,15% li eritmasi hosil qilindi. Kristallgidrat qancha hajm suvda eritilgan? a) 176,1 b) 150,0 c) 158,5 d) 168,5 e) 178,5
28. 30g kristall soda Na₂CO₃*10H₂O dan foydalanib tayyorlangan 150g eritmadagi natriy karbanatning massa ulushini 2% gacha kamaytirish uchun eritmaga qancha gramm suv qo’shish kerak?
A) 253 B) 325 C)275 D) 375 E) 400
29. 345g suvda 57,4 g ZnSO₄*7H₂O ning eritilishidan hosil bo’lgan eritmadagi tuzning massa ulushini 4% gacha kamaytirish uchun eritmaga qancha suv qo’shish kerak? A) 400.5 B) 250.8 C) 397.6 D) 402.6 E) 405.0
30. 105. 345g suvda 57,4 g ZnSO₄*7H₂O ning eritilishidan hosil bo’lgan eritmadagi tuzning massa ulushini 2% gacha kamaytirish uchun eritmaga qancha suv qo’shish kerak? A) 1150.5 B) 1050.5 C) 1297.6 D) 800.9 E) 1207.6
31. 57.4g ruh sulfatning kristallgadrati ZnSO₄*7H₂O dan foydalanib tayyorlangan 402.4 g eritmadagi ruh sulfatning massa ulushini 5% gacha kamaytirish uchun eritmaga qancha suv qo’shish kerak?
A) 255.6 B) 241.6 C) 376.2 D) 237.6 E) 337.6
32. 30g natriy karbanat kristallgidratidan Na₂CO₃*10H₂O foydalanib tayyorlangan 200g eritmadagi natriy karbanatning massa ulushini 3% gacha kamaytirish uchun qancha suv qo’shish kerak?
A) 130 B) 155 C) 140 D) 171 E) 100
33. Massasi 1,287 g bo’lgan kristall xoldagi sodaga mol miqdorda vodorod xlorid tasir ettirilganda, 100,8 ml (n.sh) gaz ajralib chiqdi. Dastlabki kristallgidratning formulasini aniqlang? a) Na₂CO₃*H₂O b) Na₂CO₃*2H₂O c) Na₂CO₃*5H₂O d) Na₂CO₃*7H₂O e) Na₂CO₃*10H₂O
34. 5,38 g rux sulfat kristallgidratini 92 ml soda eritildi. Bunda 3,31% li rux sulfat eritmasi xosil bo’ldi. Kristallgidratdagi suvning miqdorini aniqlang.
a) 2 b) 3 c) 4 d) 5 e) 6
35. Massasi 60 g bo’lgan natriy sulfatning to’yingan eritmasidagi suvsiz tuzning massa ulushi 34,2% gat eng. shu eritmadagi 10 g suvsiz tuz qo’shildi va u to’la erib ketgunicha qizdirildi, so’ngra boshlang’ich temperaturagacha sovutildi. Bunda cho’kmaga 35,4 g kristallogidrat tushdi. Kristallogidrat formulasini toping. a) Na₂SO₄*10H₂O b) Na₂SO₄*7H₂O
c) Na₂SO₄*5H₂O d) 2Na₂SO₄*7H₂O e) 3Na₂SO₄*2H₂O