Question

va rooog...tema asta e pana maine!!
Dau coroana!!!!​

Answer 1

1)

Se amestec 250 g sirop de c% = 25% cu 150 g sirop de c% = 15%. Ce concentratie finala are solutia obtinuta?

Rezolvare:

ms1 = 250g, c1% = 25%

ms2 = 150g , c2% = 15%

-------------------------------/-------

c%final = ?%

------------------------------//------

c% = mdx100/ms

=> md1 = ms1xc1/100 = 250x25/100 = 62,5g

=> md2 = ms2xc2/100 = 150x15/100 = 22,5g

=> md.final = md1+md2 = 62,5+22,5 = 85g

=> ms.final = ms1+ms2 = 250+150 = 400g

=> c%final = md.finalx100/ms.final

= 85x100/400 = 21,25%

2)

La 300g saramura de c% = 15% se adauga 250 g apa. Ce conc. procentuala finala are solutia dupa adaugarea apei?

Rezolvare:

ms1 = 300g, c1% = 15%

m.apa.adaugata = 250g

---------------------------------/-----

c%.finala = ?%

--------------------------------//----

din c% => md = msxc%/100 = 300x15/100 = 45g

ms.final = ms1 + m.apa.adaugata = 300+250 = 550g

=> c%finala = mdx100/ms.finala

= 45x100/550 = 8,2% (rotunjit)

3)

In 250g ceai cu zahar de c% = 10% se mai adauga o lingurita cu 10 g zahar. Ce concentratie are ceaiul dupa adaugarea zaharului?

ms = 250g, c% = 10%

md1 = 10g zahar

-----------------------------/---

c%finala = ?%

-----------------------------//----

din c% => md.initial = msxc%/100

= 250x10/100 = 25g

=> md.final = md.initial + md1 = 25+10 = 35g

=> ms.final = ms + md1 = 250+10 = 260g

=> c%finala = md.finalx100/ms.final

= 35x100/260 = 13,5% (rotunjit)

Answer 2

Ok Sper sa fie ok

1) Se amesteca 250 g sirop de c%=25% cu 150 g sirop de c%=15%

Ce concentratie are solutia pe care am obtinut o?

Rezolvare:

ms1=250 g si c%=25%

ms2=150 g si c2%=15%

c%final=?%

c%=mdx100/ms

md1=ms1xc1/100=250x25/100=62,5g

md2=ms2xc2/100=150x15/100=22,5g

md.final=md1+md2=62,5+22,5=85g

ms.final=ms1+ms2=250+150=400g

c%final=md.finalx100/ms.final

85x100/400=21,5%

Nu l mai stiu si pe 2 :((((((( SCUZE ENORM! NU MI AM DAT SEAMA