Question

3 4 5 6 7
Repedeeeeee

Answer 1

3.

md = 60 g

c% = 20%, c% = md x100/ms

=> ms = mdx100/c% = 60x100/20 = 300 g

ms = md + m.apa => m.apa = ms - md = 300 - 60 = 240g apa

4.

ms1 = 190 g , c%1 = 20% , md2 = 10 g

md1 = ms1xc%1/100 = 190x20/100 = 38 g

=> ms.tot = ms1 + md2 = 190 + 10 = 200 g sol

=> c%2 = md.totx100/ms.tot = (38+10)x100/200 = 24%

5.

ms1 = 200 g  , c%1 = 30%  ,  c%2 = 20% , m.apa = ? g

=> md = ms1xc%1/100 = 200x30/100 = 60 g

=> ms2 = mdx100/c%2 = 60x100/20 = 300 g

=> ms2 = ms1 + m.apa => m.apa = ms2 - ms1 = 300 - 200 = 100 g apa

6.

md2 =? g , ms1 = 50 g , c%1 = 25% , c%2 = 40%

=> md1 = ms1xc%1/100 = 50x25/100 = 12,5 g

=> md2 = ms2xc%2/100 = (ms1 + md2)x40/100

=> md2 = (50+md2)x0,4

=> md2 = 33,33 g

=> md2 - md1 = 33,33 - 12,5 = 20,83 g adaugate