Odpowiedzi

2009-09-06T12:08:37+02:00
Al= 27u
3N = 42u
9O=144u

Al + N + O = 213u
1 5 1
2009-09-06T12:30:15+02:00
Al - 27u
N - 14u
O - 16u

Al(NO₃)₃

27u + 3 * 14u + 9 * 16u = 213u
1 5 1