Question

Va rog frumos toate 4 probleme.

Answer 1

a)

m.apa = 450 g , md = 50 g,

stim ca w% = mdx100/ms

=> ms = m.apa + md = 450 + 50

= 500 g

=> w = 50x100/500 = 10%

b)

w = 15% , ms = 200 g

stim ca w% = mdx100/ms

=> md = msxw%/100

= 200x15/100 = 30 g

ms = m.apa + md

=> m.apa = ms-m.apa = 200-30

= 170 g apa

c)

m.apa = ro(apa) x V = 1x60 = 60 g,

md = 12 g glucoza

stim ca w% = mdx100/ms

=> ms = m.apa + md =60+12 = 72 g

=> w = 12x100/72 = 16,67%

d)

m.apa = 270 g , w% = 20%

ms = md + m.apa = a + 270

md = a

=> 20% = 100a/(a+270)

= 20x(a+270) = 100a

= 0,2a + 54 = a

=> a = 54/0,8 = 67,5 g HCl