15. $$ \mathrm{MgCl}_{2} $$ ning to'yingan eritmasini tayyorlash uchun 420 g tuzni necha $$ g $$ suvda eritish kerak? $$ S\left(40^{\circ} \mathrm{C}\right)=120_{\mathrm{g}} $$ A) 350 B) 450 C) 300 D) 250 16. 875 g to yingan etirma tayyorlash uchun necha $$ g $$ suv va necha $$ g $$ tuz kerak bo'ladi? $$ S\left(80^{\circ} \mathrm{C}\right)=250 \mathrm{~g} $$ A) $$ 500 ; 375 $$ B) $$ 625 ; 250 $$ C) $$ 250 ; 625 $$ D) $$ 400 ; 475 $$ 17. $$ \mathrm{NH}_{4} \mathrm{Br} $$ ning to yingan eritmasini tayyorlash uchun 250 g suvda necha $$ g $$ tuzni eritish kerak? $$ S\left(50^{\circ} \mathrm{C}\right)=80 \mathrm{~g} $$ A)102 B) 135 C) 200 D) 210 18.375 g to'yingan etirma tayyorlash uchun necha $$ g $$ suv va necha $$ g $$ tuz kerak boladi? $$ S\left(80^{\circ} \mathrm{C}\right)=150 \mathrm{~g} $$ A) $$ \mathbf{2 0 0 ; 1 7 5} $$ B) $$ 150 ; 225 $$ C) $$ 100 ; 275 $$ D) $$ 225 ; 150 $$ 19. $$ \mathrm{Na}_{2} \mathrm{CO}_{3} $$ ning to'yingan eritmasini tayyorlash uchun 495 g tuzni necha $$ g $$ suvda eritish kerak? $$ S\left(50^{\circ} \mathrm{C}\right)=110 \mathrm{~g} $$ A) 350 B) 450 C) 300 D) 250 20. 700 g to'yingan etirma tayyorlash uchun necha $$ g $$ suv va necha $$ g $$ tuz kerak bo'ladi? $$ S\left(60^{\circ} \mathrm{C}\right)=100 \mathrm{~g} $$ A) $$ 500 ; 200 $$ B) $$ 250 ; 450 $$ C) $$ 400 ; 300 $$ D) $$ 350 ; 350 $$ 21. NaClning to'yingan eritmasini tayyorlash uchun 180 g suvda necha $$ g $$ tuzni eritish kerak? $$ S\left(30^{\circ} \mathrm{C}\right)=75 \mathrm{~g} $$ A) 102 B)135 C) 200 D) 210 22. 210 g to'yingan etirma tayyorlash uchun necha $$ g $$ suv va necha $$ g $$ tuz kerak bo'ladi? $$ S\left(20^{\circ} \mathrm{C}\right)=50 \mathrm{~g} $$ A) 140;70 B) $$ 60 ; 150 $$ C) $$ 150 ; 60 $$ D) $$ 70 ; 140 $$; 23. $$ \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} $$ ning to'yingan eritmasini tayyorlash uchun 195 g tuzni necha $$ g $$ suvda eritish kerak? $$ S\left(20^{\circ} \mathrm{C}\right)=65 \mathrm{~g} $$ A) 350 B) 450 C) 300 D) 250

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15. **Javob: A) 350**

**Tahlil:**
   $$
   \text{S}(40^{\circ} \mathrm{C}) = 120 \, \text{g MgCl}_2 / 100 \, \text{g suv}
   $$
   420 g tuzni eritish uchun:
   $$
   \frac{420 \, \text{g}}{120 \, \text{g/100 g suv}} = 350 \, \text{g suv}
   $$

---

16. **Javob: C) 250 ; 625**

**Tahlil:**
   $$
   \text{S}(80^{\circ} \mathrm{C}) = 250 \, \text{g tuz / 100 g suv}
   $$
   Umumiy eritma: 875 g
   $$
   y = 2.5x \quad (\text{tuzi = 2.5 × suv})
   $$
   $$
   x + 2.5x = 875 \Rightarrow 3.5x = 875 \Rightarrow x = 250 \, \text{g suv}, \ y = 625 \, \text{g tuz}
   $$

---

17. **Javob: C) 200**

**Tahlil:**
   $$
   \text{S}(50^{\circ} \mathrm{C}) = 80 \, \text{g NH}_4\mathrm{Br} / 100 \, \text{g suv}
   $$
   250 g suvda:
   $$
   y = \frac{80}{100} \times 250 = 200 \, \text{g tuz}
   $$

---

18. **Javob: B) 150 ; 225**

**Tahlil:**
   $$
   \text{S}(80^{\circ} \mathrm{C}) = 150 \, \text{g tuz / 100 g suv}
   $$
   Umumiy eritma: 375 g
   $$
   y = 1.5x
   $$
   $$
   x + 1.5x = 375 \Rightarrow 2.5x = 375 \Rightarrow x = 150 \, \text{g suv}, \ y = 225 \, \text{g tuz}
   $$

---

19. **Javob: B) 450**

**Tahlil:**
   $$
   \text{S}(50^{\circ} \mathrm{C}) = 110 \, \text{g Na}_2\mathrm{CO}_3 / 100 \, \text{g suv}
   $$
   495 g tuzni eritish uchun:
   $$
   x = \frac{495}{110} \times 100 = 450 \, \text{g suv}
   $$

---

20. **Javob: D) 350 ; 350**

**Tahlil:**
   $$
   \text{S}(60^{\circ} \mathrm{C}) = 100 \, \text{g tuz / 100 g suv}
   $$
   Umumiy eritma: 700 g
   $$
   y = x
   $$
   $$
   x + x = 700 \Rightarrow x = 350 \, \text{g suv}, \ y = 350 \, \text{g tuz}
   $$

---

21. **Javob: B) 135**

**Tahlil:**
   $$
   \text{S}(30^{\circ} \mathrm{C}) = 75 \, \text{g NaCl} / 100 \, \text{g suv}
   $$
   180 g suvda:
   $$
   y = \frac{75}{100} \times 180 = 135 \, \text{g NaCl}
   $$

---

22. **Javob: A) 140 ; 70**

**Tahlil:**
   $$
   \text{S}(20^{\circ} \mathrm{C}) = 50 \, \text{g tuz / 100 g suv}
   $$
   Umumiy eritma: 210 g
   $$
   y = 0.5x
   $$
   $$
   x + 0.5x = 210 \Rightarrow 1.5x = 210 \Rightarrow x = 140 \, \text{g suv}, \ y = 70 \, \text{g tuz}
   $$

---

23. **Javob: C) 300**

**Tahlil:**
   $$
   \text{S}(20^{\circ} \mathrm{C}) = 65 \, \text{g Ca(NO}_3\mathrm{)}_2 / 100 \, \text{g suv}
   $$
   195 g tuzni eritish uchun:
   $$
   x = \frac{195}{65} \times 100 = 300 \, \text{g suv}
   $$

---

Agar qo'shimcha savollaringiz bo'lsa yoki tushunarsiz joylar bo'lsa, iltimos, so'rang!
15. 350 g suvda eritilishi kerak. 16. 250 g suv va 625 g tuz. 17. 200 g tuz. 18. 150 g suv va 225 g tuz. 19. 450 g suvda eritilishi kerak. 20. 350 g suv va 350 g tuz. 21. 135 g tuz. 22. 140 g suv va 70 g tuz. 23. 300 g suvda eritilishi kerak.

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