Question

Ajutorr!!va rog 25 26. 27 29 30. va rog rezolvatimi corec sa scriti ce esti ms md sau c. cu cat egal!!
Sa nu faceti direct sa scrieti ipotenuza concluzia si demonstratia .

Va rog dau 100 puncte

Answer 1

25. ms1=200g NaCl
C1=40℅
ms2=300g KCl
C2=20℅
mH2O=500g

C1=md1/ms1*100=> md1=C1*ms1/100=80g NaCl

C2=md2/ms2*100=>md2=60g KCl

mdf = md1+md2=60+80=140g

msf = ms1+ms2+mH2O=200+300+500=1000g

Cf=mdf/msf*100=140/1000*100=14℅

26. md=8 g zahăr
mH2O=72 g

ms = md+mH2O = 8+72=80g sol

C1=md/ms*100=8/80*100=10℅ [A]

msf = 80+8 = 88g sol

mdf = 8+8=16 g zahăr

C=mdf/msf*100=16/88*100=18,18℅ [B]

a) Soluția [B] se concentrează

b) [A] = 10℅ , [B] = 18,18℅

27. ms=50g
C=10℅

C=md/ms*100=>md=C*ms/100=10*50/100=5 g

ms=md+mH2O=>mH2O=ms-md=50-5=45g

mH2O/4=45/4=11,25g

msf = 5+11,25=16,25g sol

mdf = 5 g

Cf=mdf/msf*100=5/16,25*100=30,769℅

28. ms=250g sol
C=5℅
Cf=25℅

C=md/ms*100=>md=C*ms/100=5*250/100=12,5g

ms=md+mH2O=>mH2O=ms-md=250-12,5=237,5g

Cf*mH2Of=md(100-Cf) => mH2Of=md(100-Cf)/Cf = 12,5(100-25)/25 = 37,5g

mH2O evaporată = 237,5-37,5=200g

29. C=5℅

ms=150g sol

C=md/ms*100=>md=7,5g

msf = 150-25=125g sol

Cf=mdf/msf*100=7,5/125*100=6℅

30. ms=200g sol

C=20℅

+md2=10g

C1=md1/ms1*100=>md1=40g

mdf = md1+md2=40+10=50g

msf = ms1+md2=200+10=210g

Cf=mdf/msf*100=50/210*100=23,8℅