Given the following reaction: F2 + 2KBr - > Br2 + 2KF, what is the ratio between potassium bromide and diatomic bromide

2:1

Explanation:

The first step in this type of question is ensure yourself that the chemical is balanced. After establishing that, you read off the answer from the stoichiometric coefficients (the numbers in front of the formula) of potassium bromide and bromine and write those as the ratio, the molar ratio to be more specific.