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BlueDumDeeDamDaDaDam
a fost răspuns

se amesteca 300g solutie 20% cu 200g solutie 7,5% . aflati c solutiei finale​

Răspuns :

Mihaiimbrisca

Răspuns:

ms1=300g

C1=20%

ms2=200g

C2=7,5%

C3=?

md1=C1×ms1/100=300×20/100=60g

md2=C2×ms2/100=7,5×200/100=15g

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

md3=md1+md2=60+15=75g

C3=md3×100/ms3=75×100/500=15%