Umumiy kimyo I bob. Atom tuzilishi va davriy qonun Atom tuzilishi. Elementar zarrachalar – proton, neytron, elektron

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