Un amestec metan, etena si acetilena in raport molar de 1:1:1 are un continut procentual de carbon de: A.79,5%; B92%; C. 67,16%; D.85,71%; E. Niciun raspuns corect
1molCH4--> 1molC,M=16g/mol 1molC2H4--> 2molC; M=28g/mol C2H2--> 2molC; M= 26g/mol in total ,daca se ia cate 1 mol din fiecare, exista 5molC si o masa de 70g 70gamestec........5x12gC 100...........X
