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1) Ce cantitate de NaCl este dizolvata in 1200 ml solutie de concentratie 1mol/L

Răspuns :

1200ml....x moli
1000ml...1mol
x=1200/1000=1,2moli
M NaCl=A Na+ACl=23+35,5=58,5g/mol
m NaCl=1,2*58,5=70,2g