calculate the percentage by mass of oxygen in trioxonitrate(v) acid

Answer 1

I did this for you below.

Answer 2

http://www.jiskha.com/display.cgi?id=1402851831

Answer 3

thank pls i really need the answer

Answer 4

H=1×1
N=14×1
O=3×16
1+14+48=63
%mass of oxygen=16÷63×100=25.39
~25.4%