n(niu)= m/M= 146g/36,5g/mol=4molHCl
2mol........2mol..........2mol...........1mol
2Na + 2HCl---------. 2NaCl + H2
x,,,,,,,,,,,,,4mol,..........y.................z
x= 4molNa
y=4molNaCl-----> m=nxM= 4mol(23gNa+35,5gCl)/mol=............calculeaza !!
z= 1molH2-------> V= nxVm= 1molx22,4l/mol=....................calculeaza !!