Kimyoviy bog‘lanish

03-11son-50.
134. 30 g kristall sodani 200 g suvda eritib tayyorlangan eritmadagi natriy karbonatning massa ulushini 2% gacha kamaytirish uchun eritmaga qancha (g) suv qo‘shish kerak?
A) 253 B) 325 C) 275 D) 375 E) 400
03-11son-51.
135. 345 g suvda 57,4 g ZnSO₄•7H₂O ning eritilishidan hosil bo‘lgan eritmadagi rux sulfatning massa ulushini 4% gacha kamaytirish uchun eritmaga qancha (g) suv qo‘shish kerak?
A) 400,5 B) 250,8 C) 397,6 D) 402,6 E) 405,0
03-11son-52.
136. 345 g suvda 57,4 g rux sulfat kristallogidratining (ZnSO₄•7H₂O) eritilishidan hosil bo‘lgan eritmadagi rux sulfatning massa ulushini 2% gacha kamaytirish uchun eritmaga qancha (g) suv qo‘shish kerak?
A) 1150,5 B) 1050,5 C) 1297,6 D) 800,9
E) 1207,6
03-11son-53.
137. 57,4 g rux sulfatning kristallgidrati ZnSO₄•7H₂O dan foydalanib tayyorlangan 402,4 g eritmadagi rux sulfatning massa ulushini 5% gacha kamaytirish uchun eritmaga qancha (g) suv qo‘shish kerak?
A) 255,6 B) 241,6 C) 376,2 D) 237,6 E) 337,6
03-11son-54.
138. 30 g natriy karbonat kristallgidratidan (Na₂CO₃•10H₂O) foydalanib tayyorlangan 200 g eritmadagi natriy karbonatning massa ulushini 3% gacha kamaytirish uchun qancha massa (g) suv qo‘shish kerak?
A) 130 B) 155 C) 140 D) 171 E) 100
03-1son-53.
139. Zichligi 1,07 g/ml bo‘lgan 100 ml 8% li Na₂SO₄ eritmasiga qanday massadagi Na₂SO₄•10H₂O kristallogidratidan qo‘shganimizda, tuzning eritmadagi massa ulushi ikki marta ortadi?
A) 40,5 B) 50,6 C) 30,5 D) 45 E) 50
02-12son-38.
140. Zichligi 1,17 g/ml bo‘lgan 16% li 200 ml natriy karbonat eritmasi konsentratsiyasini 20% ga etkazish uchun shu eritmaga necha gramm Na₂CO₃•10H₂O qo‘shish kerak?
A) 45,64 B) 54,85 C) 65,62 D) 70,05 E) 54,95
03-1son-46.
141. 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
03-3son-30.
142. Massasi 1,287 g bo‘lgan kristall holdagi sodaga mo‘l 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
00-1son-49.
143. 5,38 g rux sulfat kristallgidratini 92 ml suvda eritildi. Bunda 3,31% li rux sulfat eritmasi hosil bo‘ldi. Kristallgidratdagi suvning miqdorini aniqlang.
A) 2 B) 3 C) 4 D) 5 E) 6
97-4son-13.
144. Massasi 60 g bo‘lgan natriy sulfatning to‘yingan eritmasidagi suvsiz tuzning massa ulushi 34,2% ga teng. Shu eritmaga 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