Răspuns:
M C₉H₁₃NO₃=9x12+1x13+14+3x16=183g/mol
183g C₉H₁₃NO₃...............108gC..............13gH.............14gN..........48gO
100gC₉H₁₃NO₃....................x%C...............y%H.................z%N...........t%O
x=100x108/183=calculeaza
y=100x13/183=calculeaza
z=100x14/183=calculeaza
t=100x48/183=calculeaza
Explicație:
