(2)m(c):m(h):m(n):m(o)=( 12×3):( 1×5):( 14× 1):(65438)
=36∶5∶ 14∶ 16
(3) The mass fraction of carbon in C3H5NO is × 100%.
= × 100%
=50.7%
According to the chemical formula of acrylamide as C 3 H 5 NO, the ratio of relative molecular mass of each element to the sum of relative atomic mass is calculated by using the sum of relative atomic mass, that is, the mass ratio of elements;
Mass fraction of an element in a substance = × 100%
The molecular weight of (1)C 3 H 5 NO is:12× 3+1× 5+1+16×1= 71.
(2)m(c):m(h):m(n):m(o)=( 12×3):( 1×5):( 14× 1):(65438)
(3) The mass fraction of carbon in C3H5NO is × 100%.
= × 100%=50.7%
So the answer is: (1) 71(2) 36: 5:14:16 (3) 50.7%.