Răspuns:
Explicație:
-CALCULEZ masa de Ca(OH)2 din solutie
C= mdX100/ms---> md=740x10/100g= 74g
-calculez masa de acid si de sare din ecuatia chimica, stiind M,H2SO4= 98g/mol, M,H2SO4=98g/mol , M CaSO4= 160g/mol
1mol................1mol............1mol sau, in grame
Ca(OH)2 + H2SO4----> CaSO4 + 2H2O
74g............>....98g.........>.....160g
calculez masa de solutie de acid
DECI md=98g
20=98x100/ms----> ms= .........................calculeaza !!!!!
