2) C=md/ms*100 ⇒ md=C*ms/100 = 53*200/100 = 106g MgCl₂
MMgCl₂ = AMg+2ACl = 24+2*35,5 = 95g/mol
Mg + 2HCl ⇒ MgCl₂ + H₂↑
24g Mg.........................95g MgCl₂
xg Mg...........................106g MgCl₂
x=24*106/95 = 26,7789g Mg
n=m/M=26,7789/24 = 1,11 moli Mg
3) C=md/ms*100 => md=C*ms/100 = 33*420/100 = 138,6g NaOH
Na + H₂O ⇒ NaOH + 1/2H₂
23g Na......................40g NaOH
xg Na.........................138,6g NaOH
x=23*138,6/40 = 79,695g Na
n=m/M=79,695/23=3,465 moli Na
Cam dubioase si problemele astea :) .. In fine, e problema ta daca nu ai scris bine cerintele..
