Question

Raport atomic,raport de masa si compozitia procentuala pentru HN02.

Answer 1

HNO2

raport atomic ---->H:N :2O=1:1:2                      (este raportul atomilor compo-
                                                                           nenti ai acidului azotos)

raport de masa---->mH:mN:2.mO=1:14:2.16=1:14:32        masele atomice
                                                                                            se gasesc in
                                                                                            sistemul periodic

Compozitie procentuala
-se poate calcula prin masa moleculara sau prin raport de masa.

Se calc. prin masa moleculara .M



MHNO2=1+14+2.16=47
Daca in 47 g HNO2 se afla 1g H, 14gN, 32g O2,  atunci in 100 g HNO2 se
afla x,y ,z.

47 g HNO2--------1g H--------14 gN----------32gO
100g-----------X-------------------Y-----------------Z
X=100.1:47=2,12 la suta H
Y=100.14:47=29,78 la suta N
Z=100.32:47=68,08 la suta O





Punctul   .  inseamna inmultit