Question

Va rog frumos sa ma ajute cineva !!!

Answer 1

Răspuns:

1. md=50

C=25%

ms=md×100/C=50×100/25=200g

mapă = ms-md=200-50=150g

2. msolvent=120g

ms=480g

md=ms-msolvent=480-120=360g

C=md×100/ms=360×100/480=calculează

3. md=200g

ms=1000g

C=?

C=md×100/ms=200×100/1000= calculează

4. md=40

m solvent =360g

ms=md+mapă =40+360=400

C=md×100/ms=40×100/400=calculează