Mavzu: Moddalarning berilgan massasi ulushi, foiz ulushi aniqlash, murakkab moddalarning formulalarini keltirib chiqarishga oid masalalar

3.05.2023 kun uchun otrabotka. Fozilova Sadoqat
Mavzu: Moddalarning berilgan massasi ulushi, foiz ulushi aniqlash, murakkab moddalarning formulalarini keltirib chiqarishga oid masalalar.
1-masala. Oltingugurt (VI)-oksid tarkibidagi elementlarning massa ulushlarini hisoblab toping.
Yechish: 1) SO₃ningM_r ni hisoblab topamiz:
M_r (SO₃) =32+316=80
2) S ningmassaulushinihisoblabtopamiz:


3) O ni massa ulushini hisoblab topamiz.


Javobi: Oltingugurtning massa ulushi 0,4 yoki 40%,
kislorodni massa ulushi 0,6 yoki 60%
2-masala. : H₂SO₄ da moddalar massa ulushini toping.
98------------100
2-----------------X
X = 2*100/98 = 2,0 %H₂
98------------100
32---------X = 32*100/98 = 32,7 %S
98---------100
64---------X = 64*100/98 = 65,3 % O₂ yoki
3-masala.  20 g osh tuzi 140 g suvda eritiladi. Tuzning massa ulushini toping?
M = 140 + 20 = 160 g
ω% = (20/160) ∙ 100% = 12,5%.
4-masala. Mis sulfat tarkibidagi misning (Cu) massa ulushini aniqlang
CuSO₄ Mr=160
(ω % = (64/160) ∙ 100%) = 40%.
5-masala. 80 gr CuSO₄ dagi Cu ning massa ulushini aniqlang?
80 gr-------------x=32
160gr-----------64 gr Cu
32/80*100%=40%
6-masala. Berilgan:
V=400ml=0.4 l
ρ=1.24g/ml
mNaOH=100g
ω =? NaOH
Yechish:0,4*1,24=496 gr eritma
ω= 100gr/496=0,2015
0,2015*100%=20.15% NaOH bor
7-masala. 30 gr NaCl 90 gr suvda eritildi. Eritmaning massa ulushini toping
m=30+90=120gr
ω=30/120*100%=25%
8-masala. 0,5 mol NaCl bor 300gr eritmada Na ning massa ulushini aniqlang
0,5 mol----------x=29,25 gr NaCl
1mol----------58,5gr

29,25 gr---------x=11,5 gr

58,5 gr----------23

(11,5/300)*100%=3,83%

9-masala. 3 mol CaCl₂ bor 400gr eritmada Ca ning massa ulushini aniqlang
3 mol-----------x=333gr CaCl₂
1mol-----------111

333gr-----------x=120 gr
111------------40gr Ca

(120/400)*100%=30%

10-masala. Birikmaning formulasini toping. X₂O₅
M₀= 5,55*10^-22/1,66*10^-24=334
334-80=254
254/2=127 yod I
Javob: I₂O₅