a) C=md/ms*100=>md=50*20/100=10g NaOH
2NaOH + H2SO4 => Na2SO4 + 2H2O
2*40g NaOH...............98g H2SO4
10g NaOH..................x=12,25g H2SO4
C=md/ms*100=>ms=md*100/C=1225/19,6= Calculeaza !
b) C=md/ms*100 => md=18,25*300/100=54,75g HCl
n=m/M=54,75/36,5=1,5 moli HCl
2Al + 6HCl -> 2AlCl3 + 3H2
2 moli Al................6 moli HCl
x moli Al................1,5 moli HCl
x=1,5*2/6= Calculeaza !!
c) C=md/ms*100=>md=22,2*4/100=0,888kg=888g CaCl2
CaCl2 + Na2CO3 => CaCO3 + 2NaCl
111g CaCl2...................100g CaCO3
888g CaCl2......................xg CaCo3
x=88800/111=800g CaCO3=0,8kg CaCO3
