A)
miuC3H8 = 3x12+8x1 = 44 g/mol
44g C3H8 ........... 3x12g C ............. 8x1g H
100% ................... a% C ................... b% H
= 81,82% C = 100-81,82 = 18,18% H
B)
miuC2H6O = 2x12+6x1+16 = 46 g/mol
46g C2H6O ......... 2x12g C .......... 6x1g H ...... 16g O
100% ...................... a% .................... b% .............. c%
= 52,17% C = 13,04% H = 34,78% O
C)
miuC6H4N2O4 = 6x12+4x1+2x14+4x16 = 168 g/mol
168g C6H4N2O4 ...... 72g C ...... 4g H ...... 28g N ...... 64g O
100% ........................... a% .......... b% .............. c% .......... d%
a = 42,86% C, b = 2,38% H, c = 16,67% N, d = 38,10% O
