Question

va rog am nevoie de ea in 20 de min. ofer 60 de puncte​

Answer 1

Răspuns:

ro=m/v---> m=roxv= 10x1g=10g=ms

md?

c= mdx100/ms===> md= cxms/100= 10x0,5/100g=0,05g sare

ms1= roxv=100g

c1=5%

md1= c1xms1/100= 5g

c2=2%

md2=md1=5g

ms2?

ms2= md2x100/c2= 5x100/2g= 250g

m,apa= ms2-ms1= 150g

c3= md3x100/ms3      unde      md3= md1+md2

                                                   ms3= ms1+ms2=200+300=> 500g

md1= c1xms1/100= 2x200/100g= 4g

md2=c2xms2/100= 8x300/100g= 24g

c3=28x100/500=5,6%

                               

Explicație: