Răspuns:
MKNO3=39+14+3×16=101g/mol
101gKNO3...............39gK..........14gN......................48gO
100gKNO3...............xgK...........ygN..........................zgO
x=100×39/101= calculeaza
y=100×14/101=calculeaza
z=100×48/101=calculeaza
Explicație: