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ajutor. clasa a 7 a. la chimie.

Ajutor Clasa A 7 A La Chimie class=

Răspuns :

md = 8g zahar

m H2O = 72g

ms=md+mH2O = 8*72=80g

C=md/ms*100 = 8/80*100 = 10% [A]

md2 = md1+md2 = 8+5 = 13g

ms2 = ms1+md2 = 80+5 = 85g

C2 = md2/ms2*100 = 13/85*100 = 15,29% [B]