Question

Cati moli din fiecare substanta se gasesc in 10 g de H2O ; 20 g de NH3 si 10 g de HCl?

Answer 1

n=m/M (molii= masa/masa molara)
M H2O = 16+2×1=18 g/mol
n H2O = 10/18 = 0.555 moli H2O
M NH3= 14+3×1=17g/mol
n NH3= 20/17=1.176 moli
M HCL = 1+35.5= 36.5g/mol
n HCL = 10/36.5 =0.273 moli HCL