76. (v15-103-2) Azot va metanning 60 ml aralashmasi 60 ml (mol miqdordagi) kislorodda yondirildi. Reaksiya tugagandan song reaksion aralashma dastlabki sharoitga keltirilganda aralashmaning hajmi 80 ml ga teng bolsa, hosil bolgan aralashmadagi azotning hajmiy ulushini (%) aniqlang.
A)25 B)30 C)50
D) 75