Odpowiedzi

2011-08-26T14:29:39+02:00

CH4

m.cz.= 12u + 4 * 1u= 16u

16u ----- 100%

12u -----   x

_______________

x= 12u * 100% / 16u

x= 75% C

 

100% - 75%= 25% H