According to the chemical formula of sodium glutamate (C 5 H 7 NO 4 Na 2 ), sodium glutamate is composed of five elements: carbon, hydrogen, nitrogen, oxygen, and sodium; 1 glutamate The sodium ammonia molecule is composed of 5 carbon atoms, 7 hydrogen atoms, 1 nitrogen atom, 4 oxygen atoms and 2 sodium atoms. There are 19 atoms in a molecule of this substance; among them, carbon The mass ratio of elements to nitrogen is (12×5): 14=30:7.

So the answer is: 5; 19; 30: 7.