On 2011April 10, the incident of "dyeing steamed bread" occurred in many supermarkets in Shanghai. After the expired steamed bread is added with preservatives such as sodium cyclamate and potassium so

On 2011April 10, the incident of "dyeing steamed bread" occurred in many supermarkets in Shanghai. After the expired steamed bread is added with preservatives such as sodium cyclamate and potassium sorbate, it is served again. (1) is analyzed according to the chemical formula C6H7KO2, which is composed of four elements: C, H, K and O; The mass ratio of C, H and O in sorbic acid = (12× 6): (18): (16× 2) = 9:1:4;

(2) According to the fact that the relative molecular mass is the sum of the relative atomic masses of the atoms that make up the molecule, the relative molecular mass of potassium sorbate is12× 6+1× 7+39+16× 2 =150; According to the mass fraction of an element in the compound, potassium = relative atomic mass of the atom × atomic number × molecular mass100% =12× 6150×100% = 48%.

So the answer is:

(1) 4; 9: 1:4; (2)48%