20 1 1 in April, 2008, a number of supermarkets in Shanghai had a "dyed steamed bread" incident, and the expired steamed bread was re-listed after adding preservatives such as sodium cyclamate and pot
20 1 1 in April, 2008, a number of supermarkets in Shanghai had a "dyed steamed bread" incident, and the expired steamed bread was re-listed after adding preservatives such as sodium cyclamate and potassium sorbate.
(1) The chemical formula of sorbic acid is C6H7KO2, and the mass ratio of carbon and oxygen in sorbic acid is =12× 6:16× 2 = 72: 32 = 9: 4.
So the answer is: 9: 4.
(2) The mass fraction of potassium in sorbic acid = 3912× 6+7+39+16× 2×100% = 26%.
So the answer is: 26%