Ответ C. /////////////////////////////////////////////////////////////////////////////////////////
M(N):m(оксида)=63,6:100
m(N):m(O)=63,6:36,4
это по массе, а нам надо перейти к количеству n(N):n(O)=63,6/14:36,4/16
4,5:2,275=2:1
N2O
12:50(без десяти час дня) - without ten the hour of the day
1.Must she ring you up before seven?
2.Can't they come early?
3.Will mother be able to clean the house tomorrow morning ?
4.Should he be here by 5 o'clock?
5.Was the man not allowed to drive a car?
6.Can ann speak French ?
7.Must they be present at the meeting?
8. Well my mother could play the piano very ?
Просто переведи и посмеетесь всем классом