Answer:
The ratio is 1:5000
Step-by-step explanation:
The high content of carbon dioxide in soda produces in consumer sensations of refresh and good tasting.
A ratio is a relationship between two numbers indicating how many times the first number contains the second.
Thus, the ratio of carbon dioxide before opening to post-opening is:
0,0004 atm/2 atm= 5000
I hope it helps!